find the circumference and the area of a circle with diameter 9 yd.

Area of a circle is equal to pi times r squared. R is radius which is 1/2 the diameter. Circumference is pi times d(diameter).
Area of this circles is equal to pi times (4.5) squared. Pi times 20.25. 20.25 times pi equals 63.61725124. Circumference= pi times 9 which equal 28.27433388.