When you triple the radius of the circle . . .
-- The diameter also triples.
-- The circumference also triples.
-- The area is multiplied by 9 .
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If the radius is tripled then the Area will be greater by a factor of 9. And the circumference will be greater by a factor of 3.
When you try to figure out an area of a circle, you square the radius, then multiply it by pi to get the area of a circle. A radius square is radius x radius, or radius squared.
The area of any circle is (pi) x (radius)2 .The area of half the circle is just half of that number.
A circle with a radius of 2.5 meters has an area of 19.63 square meters.
A circle with a radius of 10 feet has an area of 314.16 square feet.