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The base of an isosceles triangle is 21 cm long. The altitude to the base is 9 cm long. What is the approximate measure of a base angle of the triangle?

The base of an isosceles triangle is 21 cm long. The altitude to the base is 9 cm long. What is the approximate measure of a base angle of the triangle?
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The base of an isosceles triangle is 21 cm long. The altitude to the base is 9 cm long. What is the approximate measure of a base angle of the triangle?

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User Yarrow
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1 Answer

4 votes

Answer:

Explanation:

tan α=9÷(21/2)=18/21=6/7

α=arc tan(6/7)≈40.6°

answered
User Thr
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