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    OBTUSE Definition & Meaning - Merriam-Webster
    There’s a lot to understand about obtuse, so we’ll get straight to the point. Obtuse comes from a Latin word, obtusus, meaning “dull” or “blunt.”

    OBTUSE Definition & Meaning | Dictionary.com
    OBTUSE definition: not quick or alert in perception, feeling, or intellect; not sensitive or observant; dull. See examples of obtuse used in a sentence.

    OBTUSE | English meaning - Cambridge Dictionary
    He has been obtuse, difficult, totally irrational and unreasonable to the detriment of the whole of his country.

    Obtuse - Definition, Meaning & Synonyms | Vocabulary.com
    The adjective obtuse literally means "rounded" or "blunt," but when it's used for a person, it means "not quick or alert in perception" — in other words, not the sharpest tool in the shed.

    OBTUSE | definition in the Cambridge English Dictionary
    To be hackneyed, if you're a hammer (or anything that's obtuse), everything looks like a nail.

    Obtuse - Wikipedia
    This disambiguation page lists articles associated with the title Obtuse. If an internal link incorrectly led you here, you may wish to change the link to point directly to the intended article.

    OBTUSE Synonyms: 193 Similar and Opposite Words - Merriam-Webster
    The words blunt and dull are common synonyms of obtuse. While all three words mean "not sharp, keen, or acute," obtuse implies such bluntness as makes one insensitive in perception or imagination.

    obtuse - Wiktionary, the free dictionary
    Adjective obtuse (comparative obtuser or more obtuse, superlative obtusest or most obtuse) (now chiefly botany, zoology) Blunt; not sharp, pointed, or acute in form.

    Obtuse - definition of obtuse by The Free Dictionary
    1. not quick or alert in perception, feeling, or intellect; insensitive; dull. 2. not sharp, acute, or pointed; blunt. 3. (of a leaf, petal, etc.) rounded at the extremity. 4. indistinctly felt or perceived, as pain or sound. ob•tuse′ness, n.

    What does Obtuse mean? - Definitions.net
    Obtuse generally refers to an angle that measures more than 90 degrees but less than 180 degrees. In a broader sense, it can also be used to describe someone or something as not quick or alert in perception, feeling, or intellect.

     

     

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    Important Geometry Terms
    • Sine (sin): The ratio of the length of the opposite side to the length of the hypotenuse in a right-angled triangle.
    • Cosine (cos): The ratio of the length of the adjacent side to the length of the hypotenuse in a right-angled triangle.
    • Tangent (tan): The ratio of the length of the opposite side to the length of the adjacent side in a right-angled triangle ($\tan \theta = \frac{\sin \theta}{\cos \theta}$).
    • Cosecant (csc): The reciprocal of the sine function ($\csc \theta = \frac{1}{\sin \theta}$), representing the ratio of the hypotenuse to the opposite side.
    • Secant (sec): The reciprocal of the cosine function ($\sec \theta = \frac{1}{\cos \theta}$), representing the ratio of the hypotenuse to the adjacent side.
    • Cotangent (cot): The reciprocal of the tangent function ($\cot \theta = \frac{1}{\tan \theta}$), representing the ratio of the adjacent side to the opposite side.
    • Hypotenuse: The longest side of a right-angled triangle, located opposite the right angle ($90^\circ$).
    • Radian: A unit of angle measurement based on arc length, where $2\pi \text{ radians} = 360^\circ$ ($1 \text{ radian} \approx 57.3^\circ$).
    • Unit Circle: A circle with a radius of $1$ centered at the origin $(0,0)$ in the Cartesian coordinate plane, used to extend trigonometric functions to any angle.
    • Pythagorean Identity: The fundamental trigonometric identity derived from the Pythagorean theorem, expressed as $\sin^2\theta + \cos^2\theta = 1$.

     

    Industries That Use Geometry
    • Architecture & Civil Engineering: Calculates structural loads, roof pitches, bridge support angles, and land slopes to design safe buildings and infrastructure.
    • Aeronautics & Aerospace: Determines flight paths, wind drift angles, satellite orbits, and altitude trajectories for aircraft and spacecraft navigation.
    • Video Game Development & CGI: Renders 3D graphics, calculates character raycasting, models object collisions, and animates realistic movement using vector geometry.
    • Land Surveying & Cartography: Measures distances, elevation changes, and geographic boundaries across large areas using triangulation techniques.
    • Acoustics & Audio Engineering: Analyzes sound waves, models frequency harmonics, and designs soundproof spaces using sine and cosine wave functions.
    • Maritime & Ocean Navigation: Computes true heading, compass bearing, ocean current offsets, and celestial navigation coordinates for ships.
    • Electrical & Mechanical Engineering: Models alternating current (AC) voltage waveforms, electromagnetic fields, and rotational forces in motors and machinery.
    • Medical Imaging & Radiography: Reconstructs 3D cross-sectional images in CAT scans and MRI machines by calculating wave projection angles.
    • Astronomy & Astrophysics: Measures interplanetary distances, stellar parallax, and celestial movement relative to Earth.
    • Meteorology & Climate Science: Models global weather patterns, ocean wave dynamics, and solar radiation angles to predict climate and weather systems.
                    

     

     

    Important Geometry Historical Events
    • Plimpton 322 Clay Tablet (c. 1800 BC): Records ancient Babylonian mathematical tables containing advanced Pythagorean triples, marking the earliest known use of right-triangle ratios.
    • Hipparchus Compiles First Chord Table (c. 150 BC): Earns the title "Father of Geometry" by calculating circle chord values to solve astronomical triangles and track planetary motion.
    • Ptolemy Writes the Almagest (c. 150 AD): Expands chord tables and spherical geometry principles, creating a comprehensive geometric framework that dominated astronomy for over a millennium.
    • Aryabhata Introduces the Sine Function (c. 499 AD): Indian mathematician defines jya (half-chord), shifting mathematical focus from full circle chords to the modern concept of sine.
    • Al-Battani and Islamic Golden Age Innovations (c. 900 AD): Islamic scholars formalize tangent, cotangent, secant, and cosecant functions, establishing geometry as an independent mathematical discipline.
    • Regiomontanus Publishes De Triangulis Omnimodis (1464): Produces the first European textbook devoted entirely to plane and spherical geometry, standardizing trigonometric methods for navigation.
    • Rheticus Defines Ratios on Right Triangles (1596): Defines trigonometric functions directly as ratios of triangle sides rather than circle chords, creating the modern textbook approach used today.
    • John Napier Invents Logarithms (1614): Revolutionizes trigonometric computation by simplifying complex multi-digit sine and cosine multiplications into straightforward addition and subtraction.
    • Leonhard Euler Unifies Geometry and Calculus (1748): Introduces standard function notations ($\sin, \cos, \tan$) and formulates Euler's formula ($e^{ix} = \cos x + i \sin x$), connecting geometry with complex analysis.

     

     

    Essential Geometry Formulas
    • Pythagorean Identity: $\sin^2\theta + \cos^2\theta = 1$
    • Tangent Identity: $\tan\theta = \frac{\sin\theta}{\cos\theta}$
    • Reciprocal Identities: $\csc\theta = \frac{1}{\sin\theta}$, $\sec\theta = \frac{1}{\cos\theta}$, $\cot\theta = \frac{1}{\tan\theta}$
    • Sine Angle Sum Formula: $\sin(A + B) = \sin A \cos B + \cos A \sin B$
    • Cosine Angle Sum Formula: $\cos(A + B) = \cos A \cos B - \sin A \sin B$
    • Sine Double-Angle Formula: $\sin(2\theta) = 2\sin\theta\cos\theta$
    • Cosine Double-Angle Formula: $\cos(2\theta) = \cos^2\theta - \sin^2\theta$
    • Law of Sines: $\frac{a}{\sin A} = \frac{b}{\sin B} = \frac{c}{\sin C}$
    • Law of Cosines: $c^2 = a^2 + b^2 - 2ab\cos C$
    • Tangential Pythagorean Identity: $1 + \tan^2\theta = \sec^2\theta$

     

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