Question

In triangle abc ab =ac angle a=(5x +20)and the two angle is 2/5th pat of angle a .find angle a.

Answer 1

Answer: < A = 100°

Solution:

Angle sum of the triangle = 180°

$5x + 20 + \frac{2}{5} (5x + 20) + \frac{2}{5} (5x + 20) = 180 \\ \\ 5x + 20 + \frac{4}{5} (5x + 20) = 180 \\ \\ 25x + 100 + 20x + 80 = 900 \\ \\ 45x = 900 - 180 \\ \\ 45x = 720 \\ \\ x = 16$
so, angle a is

$5(16) + 20 \\ \\ = 80 + 20 \\ \\ = 100$
< A = 100°

< B = 40°

< C = 40°

Since AB = AC so

< B = < C = 40°

Hope it helps you.

Answer 2

Answer:

The answer is Angle A = 100

Angle B = 40

Angle C = 40

Step-by-step explanation:

The Explanation is in the above pic

Hope it helps you!