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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?
sine-1(0.3420201433) = 20 degrees
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90 degrees = 1/4 of a turn
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Sine of 1 minute of arc?
1 minute of arc is one sixtieth, or about 0.01667, of a degree. The sine of of 0.01667 degrees is about 0.0002909.
What two angles add to 180 degrees?
Any two supplementary angles will equal 180 degrees when added. Examples: 90+90 60+120 1+179
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