90 degrees angles or right angles.
a 90 digree angle
4 sides
In general the 4 interior angles of any quadrilateral always add up to 360 degrees
Perpendicular :)
RectangleA rectangle has 4 congruent angles, but two pairs of congruent sides instead of all sides being congruent.
Adjacent angles
There are many types of angles such as obtuse, right, acute, complementary, supplementary, adjacent, alternate, corresponding, and opposite angles, just to name a few.
a 90 digree angle
kite
rectangle
4 sides
All rhombuses have two pairs of congruent angles (opposite angles are congruent to one another - a square is a special case type of rhombus in which all four angles are congruent).
The complement of an acute angle would be another acute angle. This is because an acute angle is one that is less than 90 degrees and complementary angles are angles that add up to 90 degrees. And so, in order for the angle to be complementary it also has to be less than 90 degrees.
In general the 4 interior angles of any quadrilateral always add up to 360 degrees
A rhombus is a parallelogram with four equal sides. A square is a type of rhombus.
Perpendicular :)
RectangleA rectangle has 4 congruent angles, but two pairs of congruent sides instead of all sides being congruent.