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In AABC, AB = AC. If mzB = 80, find the measure of LA a. 20 b. 80 C. 100 d.180​

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Question

In AABC, AB = AC. If mzB = 80, find the measure of LA

a. 20

b. 80

c. 100

d.180

Answer:

  • A. 20

Solution:

➢ Equal length means equal angle.

➢ Angle B is equal to angle C

➢ The total angle of a triangle is 180°.

➢ 180°= A +B+C°

➢ 180°=A°+2B°

➢ 180°=A°+2(80°)

➢ A°=20°

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