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In a right angles triangle the sides are named the hypotenuse (the side opposite the right angle) and the other two sides are called the adjacent and the opposite sides.

1) The sine of an angle = length of the opposite side ÷ length of the hypotenuse.

2) The cosine of an angle = length of the adjacent side ÷ length of the hypotenuse.

Using 1) The length of the hypotenuse = length of the opposite side ÷ the sine of the angle.

Using tables or a calculator obtain the sine of the angle and divide this into the length of the opposite side. The result will be the length of the hypotenuse.

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Q: Find hypotenuse only using opposite and angle?
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How do you determine sine in a right triangle?

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