Answer:
56°
Step-by-step explanation:
180 = 40 + (2x) + (3x)
180 - 40 = 40 + 5x - 40
140/5 = 5x/5
x = 28
2(28)
= 56
m∠A = 56°
A triangle contains 180°. So
180 - 40 = 140
2x + 3x = 140
5x = 140
Now, plug in the value for x.
2(28) = 56
Check your work.
40 + 56 + 84 = 180
