D and E
the triangle is right as it has a right angle as one of the 3 angles
the triangle is isosceles as it has 2 equal sides , indicated by the score on the equal sides and 2 equal base angles of 45°
1
3.50
3.50
+3.50
______
10 .50
Answer is 360,,,,,,,,,........
The answer of the equation is 18.
