Question

a
11. Show that Angle ABC is isosceles if
(i) A = 70° and B = 40°.
(ii) B = 30° and C = 120°.

Answer 1

Answer:

A= 70° ,B= 40°

let we know that isosceles triangle have two side equal and third side different .

suppose A= 70° B= 40° C=X° = 180°

A+B+C= 180°

110+X=180

X=180-110=70°

let A,=70 B,=40° C=70°

HERE TWO ANGLE ARE EQUAL. A and C ARE equal and b are different.