Question

What type of triangle is triangle ABC give reasons for your answer help please I need 1 more mark But I don't know what I'm doing wrong ​

Answer 1

Answer: isosceles

Step-by-step explanation:

By the alternate interior angles theorem, $\angle CAB=50^{\circ}$

Since angles in a triangle add to 180 degrees, $\angle ACB=180^{\circ}-80^{\circ}-50^{\circ}=50^{\circ}$

Since sides opposite equal angles in a triangle are equal, $AB=BC$.

So, triangle ABC is isosceles