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Sine = Opposite divided by Hypotenuse Opposite is the side of the triangle opposite the angle (in this case the 90o angle). Hypotenuse is the side opposite the right angle in a right angle triangle. Therefore, Sine 90 = 1 because the opposite side and the hypotenuse are the same side, they are both opposite the right angle.
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Earn +20 ptsQ: Why is the sine of 90 degrees equal to 1?
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Continue Learning about Other Math
What is the sine of 20 degrees?
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