Question

What is the measure of a

Answer 1

∠ A = 19.8°

Explanation:

the 3 angles of the triangle sum to 180°

sum the 3 angles and equate to 180

5x - 18 + 4x + x = 180

10x - 18 = 180 ( add 18 to both sides )

10x = 198 ( divide both sides by 10 )

x = 19.8

Then

∠ A = x = 19.8°