If the diameter of a circle is 10.5 cm, the find its circumference and area
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If the diameter of a circle is 10.5 cm,the find its circumference and area.

Part 1:

To find circumference:

We know:

Insert value of diameter:

We know:

By using this formula we can find value of circumference of circle.

Insert value of radius and pie

Part 2:

To find area:

We know:

By using this formula we can find value of area of circle.

Insert value of radius and pie

y > 1/3x

y < = -x + 4

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