Question

The angle measures of a triangle are shown.

Angle A: (5x - 5) degrees
Angle B: (3x + 3) degrees
Angle C: (5x) degrees
Part A
What expression can be written to represent the sum of the
angle measures?

Answer 1

13x - 2

Explanation:

(5x - 5) + (3x + 3) + (5x)

5x - 5 + 3x + 3 + 5x

5x + 3x + 5x - 5 + 3

13x - 2

Answer 2

(10x - 2)° = 180°

Explanation:

Since the sum of a triangle is always 180°,

∴ (5x - 5)° + (3x + 3)° + (5x)° = 180°

5x - 5 + 3x + 3 + 5x = 180

∴ 10x - 2 = 180