An isosceles triangle has two sides of equal length. An equilateral triangle has three sides of equal length. In a right triangle, two sides meet at a right angle.

To solve this equation, replace the variables with the values given and then solve the now variable-free equation. (Remember order of operations, PEMDAS, Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.)

c(c - y)
1(-5)(-5 - 9)
1(-5)(-14)
(-5)(-14)
70

The formula for circumference is circle diameter x π. Circle diameter is 2 x radius:

c = πd
c = π(2 * r)
c = π(2 * 16)
c = 32π

The first step to solve a quadratic expression that's not set to zero is to solve the equation so that it is set to zero:

a² - 7a - 7 = -4a - 3
a² - 7a - 7 + 3 = -4a
a² - 7a + 4a - 4 = 0
a² - 3a - 4 = 0

Next, factor the quadratic equation:

a² - 3a - 4 = 0
(a + 1)(a - 4) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (a + 1) or (a - 4) must equal zero:

If (a + 1) = 0, a must equal -1
If (a - 4) = 0, a must equal 4

So the solution is that a = -1 or 4

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).