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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
288 Chapter 7
so far the square is winning
So, when it comes to providing butt-space for a 3 cubic
meter volume of water, the square shaped hot tub is better
than the circle shaped one.
The square tub beats the circle tub
Both tubs are the same depth.
Both tubs have the same area.
Work the formula for circle area backward to get the butt count
for the circle shaped hot tub.
circle area = r
2
perimeter = 2
r
Butts = perimeter
6 =
r
2
3.1415
6 = 6
0.5
0.5 = 17.3 butts
P = 2 x 3.1415 x 1.38
P = 8.67m
Butts = 8.67
= r
2
1.9m
2
= r
2
1.38m = r
radius
17.3 butts
19.6 butts
6m
2
Circumference in the
case of a circle
That’s m for meters, not a new variable!
Or 17.4 butts if you didn’t round
as you worked—either is OK.
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Publisher Resources

ISBN: 9780596808365Errata Page