1. Find Perimeter, Circumference, and Area
1.7 Essentials of Geometry

2. Perimeter Square 4s Rectangle 2l + 2w Circle (r + r) = 2r = d
Triangle a + b + c l w r c a b

3. Area
Square s2
Rectangle lw
Circle (r · r) = r2
Triangle s l w r h b

4. Helpful Formula and Ideas
Use Pythagorean Theorem to find the length of a hypotenuse of a right triangle a2+b2=c2
Break up irregular shaped objects into known geometric figures and apply formulas
Perimeter is only around the outside and individual perimeters can not be summed for the whole perimeter
Area is region inside figure and individual areas CAN be summed to find the whole area

5. Reducing a radical