Head First 2D Geometry > Circles: Going Round and Round > The diameter of a circle is twice its radius

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Head First 2D Geometry

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Table of Contents

Dedication

Advance Praise for Head First 2D Geometry

Praise for other Head First books

The Authors

How to Use this Book: Intro

Ch. 1. Finding Missing Angles: Reading Between the Lines

Ch. 3. The Pythagorean Theorem: All the Right Angles

Ch. 4. Triangle Properties: Between a Rock Show and a Triangular Place

Ch. 5. Circles: Going Round and Round

It's not just pizza—it's war!

How does MegaSlice's deal measure up?

The diameter of a circle is twice its radius

How do slices compare to whole pizzas?

Sectors of a circle have angles totaling 360°

MegaSlice's $10 deal is a con!

Pepperoni crust pizza—but at what price?

The pepperoni perimeter is 3 (and a bit) times diameter

Mario wants to put your pepperoni crust pricing formula to the test

The customers are always fussy

An arc is a section of the circumference

Mario's business is booming!

But MegaSlice is at it again...

We need to find the area of the two pizza deals

Each sector (slice) is a triangle (kind of)

Area of a circle = πr2

Mario's pizza is here to stay

Your Geometry Toolbox

Ch. 6. Quadrilaterals: It's Hip to be Square

Ch. 7. Regular Polygons: It's All Shaping Up

Index

diameter is double the radius How big are the pizzas that MegaSlice are cutting up and selling by the slice? 6" 6" 12" The pizza must be as wide as two of the slice edges--12 inches. circle

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Chapter 5. Circles: Going Round and Roun... > The diameter of a circle is twice it... - Pg. 208