Question

in triangle abc ,if ab=2 cm, ac= 2cm and angle a= 40 degree, then find angle b
please tell fast

Answer 1

Step-by-step explanation:

as ab=ac it is an isosceles triangle so the other two angles are congruent

consider it as x

x+x+40=180

$2x + 40 = 180 \\ 2x = 180 - 40 \\ 2x = 140 \\ x = \frac{140}{2} \\ \\ x = 70$

so the two angles are 70°