How do you find the surface area of a circle?

πr²

Step-by-step explanation:

The surface area of a circle is πr²

Pie is 22/7 or 3.14

While the radius of a circle is any line from the centre of a circle to any part of the circumference of the circle. A diameter is any line that cuts the circle into two equal halves, cutting the circle from the centre.

To get the surface area of a circle, you draw a line from the centre of the circle, and then touch any part of the circumference of the circle. Then you measure the line, that's the radius.

If for instance, the radius gives 7cm, you find the Square, And then multiply it with pie.

22/7 X 7 ²

22/7 X 7 X 7

22 X 7

154cm²

the equation for this situation is y=122+45. to solve the equation you would add 45 and 122 to get a total of 167lbs. in conclusion, grace's weight eight weeks ago was 167lbs.