3 years ago

Find the measure of angle A.

Mathematics

1 answer:

34kurt3 years ago

5 0

Answer:

112.6°

Step-by-step explanation:

Using cosine law:

20² = 11² + 13² - 2(11)(13)cos(A)

110 = -286cos(A)

cos(A) = -5/13

A = 112.6198649

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