Staar Grade 8 Mathematics Reference Materials Page 2
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2STAAR GRADE 8 MATHEMATICS
REFERENCE MATERIALS
CIRCUMFERENCE
Circle
or
C
= 2π
r
C
= π
d
AREA
= 1
A
b
h
Triangle
2
Rectangle or parallelogram
A
bh
=
1
A
=
(
b
+
b
)
h
Trapezoid
2
1
2
2
Circle
A
= π
r
SURFACE AREA
Lateral
Total
Prism
S
Ph
+ 2
B
S
=
Ph
=
1
1
Pyramid
S
P
=
l
S
P
B
=
l
+
2
2
2
Cylinder
S
= 2π
rh
S
2
π
rh
2
π
r
=
+
VOLUME
Prism or cylinder
V
Bh
=
= 1
Pyramid or cone
V
Bh
3
4
3
Sphere
V
=
π
r
3
ADDITIONAL INFORMATION
π ≈ 22
Pi
π
≈
3 14
.
or
7
2
2
2
a
b
c
Pythagorean theorem
+
=
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