Question

youre trying to find the value of a.
de each side of the equation by 2 to find the value of a, or the measure of the unknown angles.
2a + 100 = 180

• 100 - 100

2a = 80
2 2
= 40

Explanation:

Step1: Subtract 100 from both sides

$$2a+100 - 100=180 - 100$$
$$2a = 80$$

Step2: Divide both sides by 2

$$\frac{2a}{2}=\frac{80}{2}$$
$$a = 40$$

Answer:

40