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Head First 2D Geometry
book

Head First 2D Geometry

by Stray (Lindsey Fallow), Dawn Griffiths
November 2009
Beginner content levelBeginner
368 pages
8h 55m
English
O'Reilly Media, Inc.
Content preview from Head First 2D Geometry
you know how to find area
280 Chapter 7
Hot tub volume is area x depth
Calculating the volume of some 3D shapes can get pretty
gnarly, but for the hot tub range it’s simple. The tubs have
straight sides, so the volume can be found from area × depth.
Length
Same depth all over
Q:
This book is called Head First 2D
Geometry, right? So how come we’re
talking about 3D in this chapter?
A: Volume is definitely a 3D topic, and
we cover it in much more detail in Head
First 3D Geometry, but it’s not too bad to
dip your toes in the water is it? Also, we’re
about to turn this problem back into a 2D
one on the next page.
Q:
You’re going to turn a 3D problem
into a 2D problem? How does that
work?
A: The third dimension in the hot tubs
problem is depth. Once we don’t have to
work with the depth anymore it’s just a 2D
problem we’re left with. Hold that thought
to the bottom of the next page.
Q:
What if the tub was deeper at
one end than the other? Or had curved
sides?
A: The area × depth formula only
applies to 3D shapes with straight sides, all
of the same depth, which are perpendicular
to the base. If the hot tub was deeper
at one end we’d need a different way of
working out its volume.
These “straight-sided” shapes are
known as prisms—more about those
in Head First 3D Geometry.
[Thanks! Marketing xx]
AREA = length x width
Width
you are here 4 281
regular polygons
Our complete summer range...
All St
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Publisher Resources

ISBN: 9780596808365Errata Page