What do you notice about the third ratio, leg opposite the 63° angle to the leg adjacent the 63° angle?
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In a right triangle, the ratio of the length of the leg opposite angle A to the length of the hypotenuse. In a right triangle, the cosine of angle A is the ratio of the length of the leg adjacent to angle A to the length of the hypotenuse. It is the reciprocal of the secant function.
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We can get the ratio of the side opposite 63° angle to the hypotenuse by using sine law.
Sine Law is defined by the formula below.
Where A,B and C are the angles opposite to sides a,b,and c. Let us assign that C is the hypotenuse.
Transforming the equation to the ratio of a and c we get:
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