How can I figure out the circumfernce & the area of a 10 cm, diameter(Use- Pi=3.14)?

Question

Most important... how to find the circumfernce? Like what do I do to find the answer?

Answer 1

Properties of the circle are generally expressed in terms of r, where r is the radius, one half of the diameter.

The circumference of a circle is 2 pi r; its area is pi r^2.

In your example, r is 5 cm.

Therefore, the circumference is 2 pi 5 cm or 10 pi cm.

The area is pi 5^2 cm^2 or 25 pi cm^2.

I'll let you use your favourite value of pi.

Note that one could rewrite the usual formulae as

circumference = pi D; and area = pi D^2 / 4.

But it's less to remember to have one standard form, and the formulae with r are those usually used and quoted.

Live long and prosper.

Answer 2

The area of a circle is pi times the radius squared
circumfernce is pi times the diameter
radius=1/2 the diameter

Answer 3

Area = pi x radius^2
Circumfrence = pi x d

so Area = 3.14 x 5^2
= 3.14 x 25
= 78.5

C = 3.14 x 10
= 31.4

Answer 4

WELL THE DIAMETER IS 10

SO UR RADIUS = D/2 = 10/2 = 5

UR R = 5 CM

AND TO FIND OUT THE CIRCUMFERENCE
_
C = 2 * X * R

C = 2 * 3.14 * 5
AFTER CALCULATING IT U GET

C = 31.4 CM

AND FOR AREA
_
A = X * R^2
_
OR A = X * R *R

A = 3.14 * 5*5

U GET A= 78.5 CM^2


GET IT

Answer 5

Circunference = Pi * D = 3.14 * 10 = 31.4 cm

Area = Pi * D^2 / 4 = 3.14 * 100 / 4 = 78.5 cm2

Answer 6

Use the equations circumference = 2piR and area = pi(R^2) R is half the diameter.