Question

Answer the question in steps

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I will mark as brain list ​

Answer 1

Answer:

for Ist ques

use angle sum of triangle property

5x - 60 + 2x + 40 + 3x - 80 = 180

10x = 280

x = 28

for 2nd question

110 +2x = 180

2x = 70

x = 35

therefore A = 35 and B = 35

for 3rd question

Let angle be 4x, 3x, 2x

so 4x + 3x + 2x = 180

9x = 180

x = 20

so angles are 80, 60, 40