how d i solve

Question

a = 2πr

 

Answer 1

Hi Brenda,

The formula for the area of a circle is A = Pi * r²

If the problem gives the radius, such as r = 2 meters, then A = Pi * 2² = 3.14 * 2² = 3.14 * 4 = 12.56 square meters.

 

There is a formula for the circumference (which is the perimeter) of a circle.  That formula is C = 2 * Pi * r.

If the problem gives the radius as 5 meters, then C = 2 * 3.14 * 5 = 31.4 meters.

 

Units for area are always 'square units' and units for distances, such as a radius or circumference are simply units.

 

Hope this helps, Brenda.

Mary Ann