If one angle of a triangle is equal to the sum of the other two angles, then the triangle is
A. a right triangle
B. an isosceles triangle
C. an equilateral triangle
D. an obtuse triangle
Answer:A
If one angle of a triangle is equal to the sum of the other two angles, then the triangle is
A. a right triangle B. an isosceles triangle C. an equilateral triangle D. an obtuse triangle
Explanation: If one angle of a triangle is equal to the sum of the other two angles, then the triangle is a right triangle. We know that the sum of interior angles of a triangle is equal to 180°. In the right triangle, one angle should be equal to 90°, and the remaining two angles are acute angles, and their sum is equal to 90°.