Question

FOR BRAINLY !
Triangle angle-sum theorem

Answer 1

Answer:

v = 21

Step-by-step explanation:

3v + 4v + v + 12 degrees = 180 degrees

8v + 12 = 180

8v + 12 - 12 = 180 - 12

8v = 168

8v/8 = 168/8

v = 21

Check work:

3(21) + 4(21) + 21 + 12 = 180

63 + 84 + 21 +12 = 180

Answer 2

v=21

set equation as all sides add up to 180…
4v+3v+v+12=180
—simplify…
8v+12=180
—subtract 12 from both sides…
8v=168
—divide both sides by 8…
v=21