Question

Given: m∠ABC = x + 21, m∠CBD = 20°. What is the measure of ∠ABC?

a) x - 21
b) x + 1
c) 20°
d) x + 21

Answer 1

The measure of angle ABC is 20°

Step-by-step explanation:

The measure of angle ABC can be determined using the given information.

Given: m∠ABC = x + 21 and m∠CBD = 20°

Since angle CBD is given as 20°, we can set up an equation:

x + 21 = 20°

Subtracting 21 from both sides of the equation, we find that:

x = -1°

Therefore, the measure of angle ABC is x + 21 = -1° + 21 = 20°