Im not looking for an answer to a test, but i dont understand the formula of a the area of a circle and semicircle can someone explain?

So the area of a circle is the radius squared times pi. Pi = 3.141592... but it is usually shortened to 3.14. so basically, the area of a circle is pi * r^2. The area of a semicircle is half of this because a semicircle is half of a circle: (pi * r^2)/2

Area of circle = πR²

Area of semi-circle = half of area of circle = πR²/2

Yes, that is the correct formula. to solve this problem given the number of years, plug in the number of years for t and plug the whole thing into the