karleee33
Answered

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what's the circumference?

Whats The Circumference class=

Sagot :

Answer:

D

Step-by-step explanation:

The circumference (C) of a circle is calculated as

• C = πd ( d is the diameter )

From the diagram

the diameter (d) is the hypotenuse of the given right triangle

Using Pythagoras' identity in the right triangle

• c² = a² + b² ( c is the hypotenuse and a, b the legs )

let a = 20, b = 21 and c = d ( the diameter ) , then

d² = 20² + 21² = 400 + 441 = 841 ( take square root of both sides )

[tex]\sqrt{d^2}[/tex] = [tex]\sqrt{841}[/tex]

d = 29

Then

C = πd = 29π

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