area of a circle ?

[bt359]

hi,

this phrase is puzzling me:

"area of the circle is one half of the radius multiplied by the circumference."


is it true/false? I find it when i was reading "history of mathematics"

If i undersdant it, then it means area= (r/2) x circumference

but I didnt see this formula before ?

I am sorry if its silly question.

 

[Quaid]

this phrase is puzzling me:

"area of the circle is one half of the radius multiplied by the circumference."


is it true/false? I find it when i was reading "history of mathematics"

If i undersdant it, then it means area= (r/2) x circumference

Hi bt:

Yes, your interpretation is correct; that statement says A = r/2 * circumference

Have you seen the formulas for area and circumference?

A = Pi * r^2

C = 2 * Pi * r

What do you get, after replacing the word 'circumference' above with the expression 2*Pi*r and simplifying?

Let us know, if you need more help.

Cheers