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Trigonometric Applications in Geometry

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Calculating the height of a triangle using the sine function

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For a triangle with angle θ\theta and hypotenuse hh, the height aa opposite to θ\theta can be calculated using the sine function: a=h×sin(θ)a = h \times \sin(\theta). This is useful in finding the area of the triangle, which is 12×b×a\frac{1}{2} \times b \times a, where bb is the base of the triangle.

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Finding the length of a shadow cast by an object using tangent

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The length LL of a shadow cast by an object of height hh at an angle of elevation θ\theta of the sun can be found using the tangent function: L=h×tan(θ)L = h \times \tan(\theta). This is a practical application of trigonometry in real-life scenarios.

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Using the cosine function to find the distance between two points in space

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For two points at a distance dd in space forming an angle θ\theta with a common point, the distance xx along one axis can be found using the cosine function: x=d×cos(θ)x = d \times \cos(\theta). This is often used in navigation and astronomy.

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Law of Sines to solve for unknown sides and angles in non-right triangles

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The Law of Sines states that in any triangle, the ratio of the length of a side to the sine of its opposite angle is constant: asinA=bsinB=csinC\frac{a}{\sin A} = \frac{b}{\sin B} = \frac{c}{\sin C}. It is used to solve for unknown sides and angles in a triangle.

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Law of Cosines for finding an unknown side in any triangle

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The Law of Cosines relates the lengths of a triangle's sides to the cosine of one of its angles: c2=a2+b22abcos(C)c^2 = a^2 + b^2 - 2ab\cos(C), where C\angle C is the angle opposite side cc. It is useful when solving for unknown sides and angles.

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Finding the area of a cyclic quadrilateral using trigonometry

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For a cyclic quadrilateral with sides a,b,c,da, b, c, d and opposite angles AA and CC, the area KK can be found using Brahmagupta's formula: K=(sa)(sb)(sc)(sd)K = \sqrt{(s-a)(s-b)(s-c)(s-d)}, where ss is the semiperimeter and A+C=180A+C = 180^\circ. Trigonometry is used to find the necessary angles.

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Determining the radius of a circle given an inscribed angle and a chord length

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For a circle with an inscribed angle θ\theta subtending a chord of length cc, the radius rr of the circle can be calculated using the formula: r=c2sin(θ)r = \frac{c}{2\sin(\theta)}. Trigonometry allows calculation of rr without direct measurement.

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Evaluating the diagonal length of a rectangle using trigonometry

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For a rectangle with length ll and width ww, the diagonal dd can be found using the Pythagorean theorem where d=l2+w2d = \sqrt{l^2 + w^2}. Trigonometry comes into play when angles are involved, calculating d=lcos(θ)d = l \cos(\theta) or d=wcos(90θ)d = w \cos(90^\circ-\theta) where θ\theta is the angle between the diagonal and the length.

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Using trigonometry to determine the slope angle of a ramp

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For a ramp with vertical height hh and horizontal length ll, the slope angle θ\theta can be found using the tangent function: θ=arctan(hl)\theta = \arctan(\frac{h}{l}). This application of trigonometry is important in engineering and design.

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Applying the Double Angle Formulas in geometry

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The sine and cosine Double Angle Formulas, sin(2θ)=2sin(θ)cos(θ)\sin(2\theta) = 2\sin(\theta)\cos(\theta) and cos(2θ)=cos2(θ)sin2(θ)\cos(2\theta) = \cos^2(\theta) - \sin^2(\theta), are used to solve geometric problems involving angles that are multiples of a known angle, helping to find unknown side lengths and area.

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