# Math Help - maths problem !

1. ## maths problem !

[FONT=Tahoma][SIZE=3]( i ) the circumference of a circle ( c = 2 x 3.14 x r) is related to the radius of the circle in a direct way. Draw the circles as indicated int he table below, then measure the circumference?

( ii ) calculate the ratio circumference divided by radius is related to the formula

A 6
B 10
C 15
D 19
E 29

( iii) explain how these results help to determine the formula for the circumference. That is, explain how the ratio circumference ÷ radius is related to the formula ?

???

2. Originally Posted by johana
[font=Tahoma][size=3]( i ) the circumference of a circle ( c = 2 x 3.14 x r) is related to the radius of the circle in a direct way. Draw the circles as indicated int he table below, then measure the circumference?

( ii ) calculate the ratio circumference divided by radius is related to the formula

A 6
B 10
C 15
D 19
E 29

( iii) explain how these results help to determine the formula for the circumference. That is, explain how the ratio circumference ÷ radius is related to the formula ?

???
When you construct these circles and divide the circumference by the radius you should note that the answer is just about the same for all five circles. So if C/r is a constant then the formula for the circumference must be C = kr, where k is the constant you found when you measured it.

-Dan