volume and surface area of solids
DESCRIPTION
Volume and surface area of solids. The amount of space a figure occupies. Volume. Units for volume are cubic units: m 3 , ft 3 , cm 3 , etc. The total area of all the surfaces of a figure. - PowerPoint PPT PresentationTRANSCRIPT
VOLUME AND SURFACE AREA OF SOLIDS
VOLUME The amount of space a figure occupies.
Units for volume are cubic units: m3, ft3, cm3, etc.
SURFACE AREA The total area of all the surfaces of a figure. Surface area formulas come from adding up the
areas of each surface, using the usual area formulas to calculate (imagine unfolding a box).
Units for surface area are square units: m2, ft2, cm2, etc.
RECTANGULAR PRISM (BOX) Volume: V lwh
3
(3m)(2m)(5m)
30m [cubic meters]
V lwh
RECTANGULAR PRISM (BOX) Surface Area: 2 2 2SA lw wh lh
2 2 2 2
2 2 22(3m)(2m) 2(2m)(5m) 2(3m)(5m)
12m 20m 30m 62m [square meters]
SA lw wh lh
EXAMPLE What are the volume and surface area
of a rectangular prism with a length of 6 inches, width of 4 inches, and height of 10 inches?
3(6)(4)(10) 240 inV lwh
2
2 2 22(10)(4) 2(4)(6) 2(6)(10)
80 48 120 248 in
SA lw wh lh
CUBE The cube is just a special case of the box where
l=w=h. Since all the sides have equal length, you’ll sometimes see it given as x or s.
That means you’re really using the same formulas, but they’ve been modified to reflect that change.
3( )( )V lwh s s s s
2 2 2 2
2 2 22( )( ) 2( )( ) 2( )( )
2 2 62
SA lw wh lhs s s s s s
s ss s
EXAMPLE A cube has a volume of 64 cubic
inches. What is the length of each side, and what is the surface area of the cube?
3
3 64
64 4 in
s
s
2
2 2
6
6(4) 96 in
SA s
SA
CYLINDER Volume: Notice the formula comes
from the area of the circular base, times the height.
2V r h
CYLINDER Surface Area: The surface area formula comes from the
idea of peeling the label off a can – the circumference of the circle becomes the top edge of the label.
22 2rhSA r
CYLINDER That plus the top and bottom circle
areas gives the total surface area:
22 2rhSA r
EXAMPLE What are the volume and
surface area of the cylinder shown to the right? 2
2 3(7) 112(4) 352 in
V r h
2
2
2
2
(4)(7) 2 (
2
2
56
4)
32 88 276 in
rh rSA
PRISMS IN GENERAL The box and the cylinder are both shapes
that stand upright on their base, with the sides perpendicular to the floor.
The general name for this type of shape is a right prism, and we can make a general statement about the formula for volume…
PRISMS IN GENERAL Recall that for the box, V = lwh. Also
notice that the area of the base of the box is A = lw. So we can say the volume of a box is given by V=Ah, where A is the area of the base.
For the cylinder, we saw V=πr2h. But the area of the circular base is A = π r2. So the volume of a cylinder could be given as V=Ah, where A is the area of the base.
PRISMS IN GENERAL That turns out to be the general rule –
the volume of any right prism can be calculated from V=Ah, as long as we can calculate the area of the base.
EXAMPLE What would the
formula be for the volume of a prism with a triangular base, as shown to the right?1
2A bk
12
V Ah bkh
PYRAMID (SQUARE BASE) Volume: 21
3V s h
PYRAMID (SQUARE BASE) Surface area: Again, surface area
comes from picking apart the figure and finding the area of each surface.
e is called “slant height” and is the height of the triangle that forms the side of the pyramid
2 142
SA s se
2 214
she
PYRAMID (SQUARE BASE)
2A s 2 2 2
2 2
1 )(214
h
e h s
e s
2
41A se
2 142
SA s se
EXAMPLE What are the volume and
surface area of the pyramid shown to the right?
2 2 31 1 (4) (10)3 3
53.33 ftV s h
2 2 2 21 1 (4)4 4
10 104 10.20he s
2 2 214 (4) 972(4)(10.20)2
.6 ftSA s se
CONE Volume: 21
3V hr
CONE Surface area: As with the pyramid, e is the slant
height or edge height, and its formula comes from the Pythagorean Theorem
2S r reA
2 2e r h
2r
re
EXAMPLE What are the volume and
surface area of a cone with the dimensions shown in the figure?
2 2 3(10)1 1 (30) 3142 cm3 3
rV h
2 2 2 210 30 1000 31.6he r
2 2 2(10) (10)(31.6) 1307 cmrS eA r
PYRAMID (GENERAL BASE) We can make the same observation and
generalization about pyramids (and a cone is just a pyramid with a circular base) that we did about cylinders: if we know the area A of the base of the pyramid, the volume can be calculated from
13
V Ah
SPHERE Volume: Surface area:
343
V r
24SA r
EXAMPLE What are the volume and surface area
of a sphere with radius 2 ft?
3 3 3(24 ) 33.53
ft43
rV
2 2 2(2) 50.3 ft4 4rSA
THE END