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Take a triangle with internal angles α, β, and 90o. Let us call the hypotenuse ℎ. Which expression gives the length of side b, which is opposite to angle β?

User Margrit
by
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1 Answer

3 votes

Answer:

b = h cos α.

Explanation:

sin β = b / h

b = h sin β.

or cos α = b / h

so b = h cos α.

User Leiyc
by
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