Question

Please explain the answer with explanation.

Answer 1

(x + 5) + (x + 15) + (2x - 30) = 180 (Angle sum property)

= x + 5 + x + 15 + 2x - 30 = 180

= -10 + 4x = 180

4x = 180 + 10

4x = 190

$x = \frac{190}{4}$

x = 47.5

x + 5 = 47.5 + 5 = 52.5

x + 15 = 47.5 + 15 = 62.5

2x - 30 = (2 × 47.5) - 30 = 95 - 30 = 65

Answer 2

Answer:

x-5+x+15+2x-30=180

4x-20=180

4x=200

x=50

sides are 45°,65°and 70°

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