Geometry Formulas
Areas and Perimeters
Figure Sketch Area Perimeter
Square A = s2 P = 4s
Rectangle A = lw P = 2l + 2w
Parallelogram A = lh P = 2l + 2w
Trapezoid A =
)(
2
121 bbh
P =
2121 bbss
Triangle A =
bh
2
1
P =
bss 21
Area and Circumference of a Circle
Circle A =
2
r
C =
r2
or C =
d
l
w
l
s
h
b1
b2
h
s2
s1
s1
s2
h
b
r
d
w
