Question

- In a triangle ABC, if angles A + C =
140° and angleA + 3angleB = 180°, then
angle A is equal to
(1) 80° (2) 40
(3) 60° (4) 20°​

Answer 1

Answer:

60 degrees

Step-by-step explanation:

by pythagoras theorem,

A + B + C = 180

140 + B = 180 (since, a + c = 140)

B = 40

A.T.Q.

A + 3B = 180

A + 120 = 180

A = 60

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