Question

What is the measure , in degrees of the angle marked B?

Answer 1

Answer:

38

Step-by-step explanation:

you want to add 77 + 65 and then subtracted by 180

Answer 2

Answer:

B = 142

Step-by-step explanation:

First, you need to find the angle of the third angle of the triangle. The three angles of a triangle always add up to 180, so it will be:

n + 77 + 65 = 180

= n + 142 = 180

= n = 38

Now, you need to find the angle supplementary to 38, as 38 and B are linear angles. Two supplementary angles add up to 180, so:

B + 38 = 180

= B = 142