Question

Theorem 7.3: The sides opposite to equal angle
of a triangle are equal.
Given : In A ABC, B = 2C.
To prove : AB = AC.​

Answer 1

Answer:

CONSTRUCTION:draw AD perpendicular to BC

PROOF : consider ADB and ADC

angle d= angle d

angle b = angle c

AD = AD

by A. A. S rule

AOB is congruent to ADC

AB = BC (by C. P. C. T)