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Any two angles whose sum is equal to 90 degrees are called "complementary angles".
A straight angle is a line which has an angle of 180 degrees therefore two right angles (90 degrees) make a line.
two supplementary angles * * * * * NO! Supplementary angles sum to 180 degrees = 2 right angles. The correct answer is complementary angles.
Equilateral Triangles do not contain right angles, since all angles in this shape are equal and it is impossible to make a triangle that consists of three 90 degress angles. Isosceles and Scalene may contain a right angle.
to make an quilateral hexagon (all the angles identical) each internal angle should be 108 degrees.