Geometry Reference Materials
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1
2STA
AR
STAAR GEOMETRY
TM
REFERENCE MATERIALS
State of Texas
Assessments of
Academic Readiness
CIRCUMFERENCE
or
= π
Circle
C
= 2π
r
C
d
AREA
= 1
A
b
h
Triangle
2
Rectangle or parallelogram
A
bh
=
1
A
d d
=
Rhombus
2
1 2
1
A
=
(
b
+
b
)
h
Trapezoid
2
1
2
1
A
aP
=
Regular polygon
2
2
Circle
A
= π
r
SURFACE AREA
Lateral
Total
Prism
S
Ph
S
Ph
+ 2
B
=
=
1
1
S
=
P
l
S
P
l
B
Pyramid
=
+
2
2
2
Cylinder
S
= 2π
rh
S
2
π
rh
2
π
r
=
+
2
Cone
S
= π l
r
π
π
S
=
r
l
+
r
2
π
Sphere
S
= 4
r
VOLUME
Prism or cylinder
V
=
Bh
= 1
V
Bh
Pyramid or cone
3
4
3
V
π
r
Sphere
=
3
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