Why the deadweight loss from a tax is proportional to the square of the tax rate? I can't understand this. Could you please explain it more precisely?

Principles of Microeconomics
7th Edition
ISBN:9781305156050
Author:N. Gregory Mankiw
Publisher:N. Gregory Mankiw
Chapter8: Application: The Cost Of Taxation
Section: Chapter Questions
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-In fact, as taxes increase, the deadweight loss rises more quickly than the size of the tax.

-The deadweight loss is the area of a triangle and the area of a triangle depends on the square of its size.

-If we double the size of a tax, the base and height of the triangle both double so the area of the triangle (the deadweight loss) rises by a factor of four.

This is an excerpt from Chapter 8: Application the Costs of Taxation, Principles of Economics by Mankiw. 

Why the deadweight loss from a tax is proportional to the square of the tax rate? I can't understand this. Could you please explain it more precisely?

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