The side opposite the right angle is called the hypotenuse.
a quadrilateral where each angle is a right angle
Two lines that form a right angle at their point of intersection is called perpendicular lines.
Perpendicular Lines form right angles at their point of intersection
the distance around geometric figure is called
A triangle is a geometric figure that is made of three line segments. It is a closed figure and has three angles.
It is a circle or a sphere