The story of diameter

Chapter 1

The math of the middle

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Answer

Chapter 2

Sizing up the cosmos

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Chapter 3

Engineering the everyday

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YOUR GOAL

Master of The story of diameter

Ch 3 · Engineering the everyday

hue Compact Disc Diameter

Twelve centimeters wide, just to hold the whole Ninth Symphony!

hue The secret life of tree rings

Why coins are sized differently

hue Why coins are sized differently

Fun Fact

Tree trunk size: The General Sherman sequoia tree has a maximum ground-level diameter of 11.1 meters, making it wider than a three-story house.

The secret life of tree rings

hue The secret life of tree rings

Glossary

diameter (noun)
A straight line segment that passes through the center of a circle or sphere and has its endpoints on the boundary. A tree's resistance to snapping under wind loads scales with its trunk's diameter cubed.

Quiz

What photographic effect is created by using a lens with a very wide aperture diameter?

Gossip

Which coin size feels the most satisfying to hold?

The Daily Diameter

hue The Daily Diameter

hue Standardizing the pipes beneath us

Quiz

What is the name of the world's largest single-stem tree by volume, famous for its massive diameter?

hue Camera lenses and light control

Quiz

What standard height do foresters use to measure a tree's diameter at breast height (DBH)?

hue Why coins are sized differently

Quiz

How do vending machines instantly identify different coins dropped into them?

Quiz

What does the 'Nominal Pipe Size' (NPS) system primarily refer to in plumbing?

Quiz

In photography, what is the opening inside a lens whose diameter controls light intake called?

Quiz

Why do plumbing pipes use standardized inside and outside diameters?

Quiz

Why do different coin denominations have distinct diameters?