Question

In triangle ABC,AB= AC and angle B = 2/5th of angle A find the measure of angle A

Answer 1

Answer:Angle a = 100

Step-by-step explanation:

let angle a be 'x'

therefore angle b = angle c = 2/5x

by angle sum property 2/5x + 2/5x + x  = 180

4/5x + x = 180

4/5x + 5/5x = 180 (taking lcm)

9/5x = 180

9x= 180*5

9x = 900

x=100 (Angle A)

2/5x = 40 (Angle b and c)

Answer 2

Answer:

angle A is 100°.hope it helps you