Question

Which of the following CANNOT be true for a triangle?

A. A triangle can be equilateral and obtuse at the same time.
B. A triangle can be equilateral and equiangular at the same time.
C. A triangle can be isosceles and right at the same time.
D. A triangle can be scalene and obtuse at the same time.

Answer 1

A. A triangle can be equilateral and obtuse at the same time

Explanation:

All angles in an equilateral triangle are 60° therefore they cannot be above 90° and less than 180°