Question

what is a triangle which has an angle of 90 degrees? a right triangle an obtuse triangle an acute triangle a scalene triangle

Explanation:

A right - triangle is defined as a triangle that has one angle equal to 90 degrees. An obtuse triangle has one angle greater than 90 degrees, an acute triangle has all angles less than 90 degrees, and a scalene triangle is defined by having all sides of different lengths (not by angle measure).

Answer:

A. A right triangle