Find Perimeter, Circumference, and Area 1.7 Essentials of Geometry

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

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

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

Reducing a radical