A circle is a figure in which each point around its perimeter is an equal distance from the center. The radius of a circle is the distance between the center and any point along its perimeter. A chord is a line segment that connects any two points along its perimeter. The diameter of a circle is the length of a chord that passes through the center of the circle and equals twice the circle's radius (2r).

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

c² + 5c - 24 = 0
(c - 3)(c + 8) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (c - 3) or (c + 8) must equal zero:

If (c - 3) = 0, c must equal 3
If (c + 8) = 0, c must equal -8

So the solution is that c = 3 or -8

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

The formula for circumference is circle diameter x π:

c = πd
c = 9π

To solve this equation, isolate the variable for which you are solving (a) on one side of the equation and put everything else on the other side.

-3a - 7y = 7a - 8y + 1
-3a = 7a - 8y + 1 + 7y
-3a - 7a = -8y + 1 + 7y
-10a = -y + 1
a = \( \frac{-y + 1}{-10} \)
a = \( \frac{-y}{-10} \) + \( \frac{1}{-10} \)
a = \(\frac{1}{10}\)y - \(\frac{1}{10}\)