Warm ups 4-10-08

Mark received a huge piece of chocolate shaped like a trapezoid that covered 98

square inches of his desk for his birthday!! Write two equationsWrite two equations that could be used to

determine the height of the chocolate.

16 in

? in 2bhA

12 in

9828

1

28h196

2. 196 = 28h

1. 98 = 14h

Volume Formulas

• Cube V = 3s

ss

sVolume is side x side x side

Volume Formulas

• Rectangular Prism

L

L

L w

w

w

h

h

h

•V = lwh or

•Volume is length x width x height or

•Volume is AREA OF THE BASE x height or

•Volume is Bh

V= Bh

Volume Formulas

• Triangular Prism

b

h

A= bh / 2b

h

A = bh / 2

BB

h

h

•V= (bh / 2)h or

•Volume is Area of triangular base x height of prism or

•V= Bh

V= Bh

Volume Formulas

• Cylinder

hrv 2Volume is AREA OF CIRCLE BASE x height

Or v=Bh

r

h

V = 3.14 x r x r x h

V=Bh

Something about cylinders…• On a cylinder net…….

One dimension of the rectangle MUST be equal

to the CIRCUMFERENCE of the base(s)

C=21 C=21

C=21 C=21

d=7

d=7

7

21

!!!!!NOT equal to the diameter of the base!!!!!!!!!!!!

Okay!