2 years ago

SOMBODY PLEASE HELP

Mathematics

1 answer:

arsen [322]2 years ago

6 0

Step-by-step explanation:

Step 1: 180degree-99degree

answer gives you 81degree

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2 years ago

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2 years ago

In triangle ABC, a = 9, c = 5, and angle B = 120°. Find the measure of angle A to the nearest degree. Show your work.

slamgirl [31]

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Angle A = 39°

Step-by-step explanation:

We are given that there is a triangle ABC where a = 9, c = 5 and angle B = 120° and we are to find the measure of angle A.

But first we need to find the side b using the law of cosine:

$b^2 = a^2 + c^2- 2a*c*cos(120)$

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$b=\sqrt{151}$

Now finding angle A using law of cosine:

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