Grade 8 Math Chart

Cessily Flores2nd pd P.I.T

Perimeter: The outside of the object

Square• P=4s

Rectangle• P=2l=2w or P=2(l+w)

Word Problem: What is the perimeter?

A.45B.39C.60D.34 • 12 in

• 5in

Word Problem:

If the side is 9.25. What is the perimeter?

• A. 38• B.30• C.28.5• D.40

Circumference: All around the circle

CircleC=2r

C=2r or C=d

Word Problem:

The diameter is 13. What is the circumference?

• A. 40.82• B.38• C.12.25• D.41.30

Area: The inside of the object

Square A=s²

TriangleA=½bh or A=bh÷2

Circle A=r²

RectangleA=lw or A=bh

TrapezoidA=½(b¹+b²)h

Word Problem:• Find the area of the triangle.

• A. 30• B. 22 • C. 22.5• D. 19 h=6

7.5

Word Problem:

If the length is 10 and the width is 23 what is the area?

• A.20• B.230• C.33• D.55

Word Problem:

• A.121• B.22• C.44• D.211

• If the side length is 11. What's the area?

Word Problem:

What is the area?

10

6

• A.25• B.192• C.16• D.384

• h=24

Word Problem:

• If the diameter is 3. What is the area?

• A.7.065• B.9.24• C.765• D.8.0

Surface Area: The inside of a three-dimensional shape.Total is all the of the shape.

Lateral is only the sides.

Cube(total) S=6s²

Pyramid(total)S=½Pl+B

Pyramid(lateral)S=½Pl

Prism(total)S=Ph+2B

Prism(lateral)S=Ph

Cylinder(lateral)S=2rh

Cylinder(total)S=2rh+2r² or S=2r(h+r)

Word Problem:

Word Problem:

• Find the lateral surface area of the prism.

Word Problem:Find the surface area of the prism.

Volume

PrismV=Bh

Cylinder V=Bh

Pyramid V=¹/³Bh

Cone V=¹/³Bh

SphereV=1/3r³

Word Problem:

Pi

=3.14 or =22/7

Pythagorean Theorem:

a²+b²=c²

Simple Interest Formula:

I=prt

P represents the Perimeter of the Base of a three-dimensional figure.

B represents the area of the Base of a three dimensional figure.

Thank You For Watching(: