Question

ABC is isosceles.
m < a = 3x + 40 and m < c = x + 50
what is m < a ??​

Answer 1

• 55°

Explanation:

It is assumed the angles A and C are congruent:

• 3x + 40 = x + 50
• 3x - x = 50 - 40
• 2x = 10
• x = 5

m∠A = 3*5 + 40 = 55°

Answer 2

solution given:

m<a=m<c

3x+40=x+50

3x-x=50-40

x=10/2=5

now

<a=3×5+40=55°

m<a=55° is your answer