A right triangle has sides 20 and 48. Use the Pythagorean Theorem to find the length of the hypotenuse

Let assume the hypotenuse(longest side of right triangle) be x

By Pythagoras theorem

c = xa = 20b = 48

Applying Pythagoras theorem

Hence , the length of hypotenuse is 52.

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.