November 2009
Beginner
368 pages
8h 55m
English
Content preview from Head First 2D Geometry
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284 Chapter 7
working backward is fair game
Work backward from area to find butt-space
Normally, you’re given the lengths of the sides of a shape and you
push them through a couple of formulas to get area and perimeter:
But in this case, you know your hot tub area, and you need to find
the length of the sides that would give that area, so you can use
them to find the perimeter (butt-space). To do this you need to work
backward.
Side
length
Perimeter
Start
Area
formula
Perimeter
formula
Area
Side
length
Perimeter
Start
Area
formula
Perimeter
formula
Area
Usually this is
what you’re given.
Often you’re aiming
for one of these.
We know the area
of our hot tub.
We need to find the
side length first.
This is our goal.
you are here 4 285
regular polygons
Use any formula you know for area of a square to find the side lengths of the square hot
tub with 6 square meters area.
Then use the side length to find the perimeter.
If each butt requires 0.5 meters of perimeter, how many butts fit in this square hot tub?
6m
2
Reviewing isn’t cheating! Quads
area formulas: page 272.
286 Chapter 7
exercise solution
Area of a square = side length x side length
If you had width x height
that works too—but in a
square the width ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.