PLS help. 30 points and brainliest In triangle ABC, a = 3, b = 5, and c = 7. Find the measure of B.

158°
142°
38°
22°

C

Step-by-step explanation:

Since we are given three sides and we want to find an angle, we can use the law of cosines.

The law of cosines is given by:

In this case, a = 3, b = 5, and c = 7. Therefore:

Evaluate:

Therefore:

Dividing both sides:

And by taking the inverse cosine of both sides:

Our answer is C.

the figures below are made out of circles, semicircles, quarter … find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations). remember that we'll also have to cut whatever areas we get in half, since we're only dealing im pretty sure that is the right answer

step-by-step explanation:

i would need to see the dot plot : )