The two lines on the left intersect each other at a rightangle, which is 90 degrees.
The two lines on the right are parallel, which means theynever cross.
The adjacent sides of a rectangle are perpendicular, whichmeans they meet at a 90 degree angle.
The opposite sides of a rectangle are equal and 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 andcircumference, which is the distance around the circle.
The area of a circle is PI R squared, well, R is the radiusand PI is the ratio of a circle circumference to its diameter.
A sphere is a three dimensional figure with a radius and avolume, which is 4/3 PI R cubed.
All points on the surface of a sphere are equidistant fromits center.
A right triangle is a two dimensional figure with 3 sides,two of which are perpendicular.
To find its area, multiply the length of the twoperpendicular sides, A & B, and divided by two, A equals one half A B.
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