Question

Please give the actual reason clearly because everything i tried won’t give me the 2 needed marks

Answer 1

Answer:

Step-by-step explanation:

Angle BAC = Angle ACD = 50 degrees, because they are alternate angles.

Angle ACB = 180 - (50 + 80) = 50 degrees, because angles in a triangle sum up to 180 degrees.

Since Angle BAC = Angle BCA, triangle ABC is isosceles.

Answer 2

Answer:

The triangle is an isosceles triangle because 2 of the sides have the same measure and 1 of the sides does not.

Step-by-step explanation: