Yes, the definition of complementary angles is that their sum is 90 degrees. All 90 degree angles are by definition right angles.
any two or more angles that equeal 90 degrees supplementary angles are when two or more angles equal 180 degrees
A 12 sided shape with equal sides and with equal interior and exterior angles
A scalene triangle is one where none of the sides or angles are equal.
All three sides are equal in length and all three interior angles are equal in size.
A square has 4 equal angles, by definition; it is a specific type of rhombus.
Yes, the definition of complementary angles is that their sum is 90 degrees. All 90 degree angles are by definition right angles.
Equilateral triangles have three equal sides and three equal angles. By definition, the angles must always measure 60 degrees each.
The only shape that always has equal sides and equal angles is the square.Other shapes can have equal sides and angles (like a triangle or octagon), but they are not by definition equilateral.--------I think it is worth noting that any regular polygon satisfies the definition. Conversely, as you point out, you have to explicitly specify that it is regular.
All sides and angles are equal in measurement
A triangle with 3 equal sides and angles.
None, by definition
Four equal sides and four right angles is the definition of a square.
Vertical angles are, by definition, equal. So if one is obtuse then so is the other.
any two or more angles that equeal 90 degrees supplementary angles are when two or more angles equal 180 degrees
nothing fits the definition of rhombus and rectangles becauses the definition for rectangle is : a plane figure with four straight sides and FOUR RIGHT ANGLESbut the definition of rhombus is...a parallelogram with ,OPPOSITE EQUAL ACUTE ANGLES and OPPOSITE EQUAL OBTUSE ANGLES, and four equal sides.
A 12 sided shape with equal sides and with equal interior and exterior angles