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User Jens Roland
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1 Answer

2 votes

Answer:

∠ A ≈ 24.1°

Explanation:

Using the law of sines , then


(9)/(sinA) =
(21)/(sin72) ( cross- multiply )

21 × sinA = 9 × sin72° ( divide both sides by 21 )

sinA =
(9sin72)/(21) , then

∠ A =
sin^(-1) (
(9sin72)/(21) ) ≈ 24.1° ( to the nearest tenth )

User Larry Osterman
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