The two lines on the left intersect each other at a right angle which is 90°.
The two lines on the right are parallel which means they never cross.
The adjacent sides of a rectangle or perpendicular which means they meet at a 90° angle.
The opposite sides of a rectangle or equal in parallel which means they never cross.
The area of a rectangle is the length times the width.
A circle is a two dimensional figure with a radius and a circumference which is the distance around the circle.
The area of a circle is pi R squared where R is the radius and pi is the ratio of a circle circumference to its diameter.
A sphere is a three dimensional figure with a radius and volume which is 4/3 pi R cubed.
All points on the surface of a sphere are equidistant from it center.
A right triangle is a two dimensional figure with three sides to avoid your perpendicular to find its area multiply.
The length of the two perpendicular sides ANB and divide by two equals 1/2 a bee
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