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erica [24]
3 years ago
14

Can someone help and explain

Mathematics
1 answer:
BaLLatris [955]3 years ago
5 0

Answer:

∠ A ≈ 43.1°

Step-by-step explanation:

Using the Sine rule in Δ ABC , that is

\frac{a}{sinA} = \frac{c}{sinC} , substitute values

\frac{20}{sinA} = \frac{29}{sin82} ( cross- multiply )

29 × sinA = 20 × sin82 ( divide both sides by 29 )

sinA = \frac{20sin82}{29} , thus

∠ A = sin^{-1} (\frac{20sin82}{29} ) ≈ 43.1° ( to 1 dec. place )

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