1.7
Find Perimeter, Circumference, and Area
p. 49
Review:
Perimeter is the distance around a figure.
Circumference is the distance around a circle.
Area is the amount of surface covered by a figure.
Formulas for Perimeter P, Area A, and Circumference C.
Square
s = side length
p = 4s
A = s2
Rectangle
b = base (length)
h = height (width)
p = 2b + 2h
A = bh
Triangle
Circle
p = sum of the three sides
A = bh
2
d = diameter
r = radius
C = πd = 2πr
A = πr2
Pi (π) is the ratio of the circle’s circumference to its diameter.
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