A line segment is a portion of a line with a measurable length. The midpoint of a line segment is the point exactly halfway between the endpoints. The midpoint bisects (cuts in half) the line segment.

The formula for area is πr²:

a = πr²
a = π(5²)
a = 25π

A quadrilateral is a shape with four sides. The perimeter of a quadrilateral is the sum of the lengths of its four sides.

The first step to solve a quadratic equation that's set to zero is to factor the quadratic equation:

x² + 9x + 8 = 0
(x + 1)(x + 8) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (x + 1) or (x + 8) must equal zero:

If (x + 1) = 0, x must equal -1
If (x + 8) = 0, x must equal -8

So the solution is that x = -1 or -8

To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.

6a x 6b = (6 x 6) (a x b) = 36ab