A right angle is an angle that is exactly 90 degrees, and it's the standard in math for comparing other angles.
A cuboid is a prism with a rectangular base. A cube is a special kind of cuboid, a cuboid with all six faces being squares.
A rectangle, also called a rectangle, is a parallelogram with one right angle, and all four of its angles are right angles.
The diameter refers to a line that passes through the center of a circle and has both ends on the circle, usually represented by the letter d. It’s the longest line inside the circle and its length is exactly twice the radius.
In math, rotation refers to the movement of a shape turning around a fixed point by a certain angle, without changing its shape or size.
Rotational symmetry means that a shape can match up with itself after being rotated around its center by a certain angle.