To solve this equation, repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the > sign and the answer on the other.

4c + 4 > \( \frac{c}{-8} \)
-8 x (4c + 4) > c
(-8 x 4c) + (-8 x 4) > c
-32c - 32 > c
-32c - 32 - c > 0
-32c - c > 32
-33c > 32
c > \( \frac{32}{-33} \)
c > -\(\frac{32}{33}\)

The perimeter of a triangle is the sum of the lengths of its sides:

p = x + y + z
p = 5cm + 7cm + 6cm = 18cm

The circumference of a circle is the distance around its perimeter and equals π (approx. 3.14159) x diameter: c = π d. The area of a circle is π x (radius)² : a = π r².

An equation is two expressions separated by an equal sign. The key to solving equations is to repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the equal sign and the answer on the other.

A right angle measures 90 degrees and is the intersection of two perpendicular lines. In diagrams, a right angle is indicated by a small box completing a square with the perpendicular lines.