Find the circumference of a circle with radius 8 inches.

What is the total area of the figure?

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

Technicians have installed a center pivot, circular irrigator for a farm that covers 25 acres. a.) how long is the irrigation boom (in feet) from the center pivot to its farthest extent? b.) if the irrigation boom makes 4 full revolutions in a day, how many miles does the end of the boom travel in 5 days?