Which of the following cannot be the measures of an isosceles triangle ABC?A. Angle A is `50^(@)` and angle B is `80^(@)`B. Angle A is `65^(@)` and angle B is `50^(@)`C. Angle A is `60^(@)` and angle B is `70^(@)`D. All of these

Which of the following cannot be the measures of an isosceles triangle

1.	Which of the following cannot be the measures of an isosceles triangle ABC?A. Angle A is `50^(@)` and angle B is `80^(@)`B. Angle A is `65^(@)` and angle B is `50^(@)`C. Angle A is `60^(@)` and angle B is `70^(@)`D. All of these
Answer» Correct Answer - C If any two angles of a triangle are equal, then the triangle is isosceles. The sum of all angles of a triangle is `180^(@)`. Choice (a) : Angle A is `50^(@)` and angle B is `80^(@)`. Angle C = `180^(@)-50^(@)-80^(@)=50^(@). rArrABC` is an isosceles triangle. Choice (b) : Angle A is `65^(@)` and angle B is `50^(@)`. Angle ` C= 180^(@)-65^(@)-50^(@)=65^(@).rArrABC` is an isosceles triangle. Choice (c) Angle A is `60^(@)` and angle B is `70^(@)`. Angle `C=180^(@)-60^(@)-70^(@)=50^(@)rArrABC` is not an isosceles triangle. Hence, choice (c) follows. Hence, the correct option is (c).