Evaluate the expression if a = 2, b = −3, c = −4, h = 6, y = 4, and z = −1. 5+|2b|
1 answer:
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Answer:
∠ ABC ≈ 137.9°
Step-by-step explanation:
Using the Cosine rule in Δ ABC
cos B =
with a = 89, b = 144, c = 65
cos B = =
=
, thus
B = ( -
) ≈ 137.9° ( to the nearest tenth )