 Practice: Circumference & Area Terms of Use    Contact Person: Donna Roberts  Directions: Read carefully. Answers use π= 3.141592654, the full calculator entry on the TI series, and are rounded to the designated instructions.

1.
The diameter of a circular hula hoop is 36 inches. Find the circumference of the hoop to the nearest tenth of an inch.

Choose:
 56.5 inches 113.1 inches 226.2 inches 1017.9 inches 2.
A circle has a circumference of 24π.
a) What is the radius of the circle?
Choose:
 8 12 16 24

b) What is the area of the circle?
Choose:
 24π 36π 144π 576π 3.
Skeeter's performance for the talent show will be jumping through a hoop. Skeeter requires a width of 18 inches so his ears to not hit the hoop. Will a hoop with an inner circumference of 39.8 inches be large enough for Skeeter's performance?
Choose:
 Yes No 4.
The center of a circle is located at (5,4). The circle passes through the point (8,4).
a) Find the circumference of the circle in terms of π.
Choose:
 3π 6π 9π 36π

b)
Find the area of the circle in terms of π.

Choose:
 3π 6π 9π 36π 5.
A large pizza has a circumference of 72.5 inches.  Which of the perimeters listed below could belong to the smallest square box capable of holding a large pizza?

Choose:
 23 inches 24 inches 73 inches 96 inches 6.
Jason and Snoopy run 3 laps around a circular track with a diameter of 85 feet. To the nearest foot, how many feet will they have run?

Choose:
 267 feet 534 feet 801 feet 1602 feet 7.
The circumference of a circle is 12.4π. Find the area of the circle.
Choose:
 24.8π 38.44π 49.6π 153.76π

8.
An arched window has dimensions as shown at the right. Consider the top of the window to be a semicircle.
a) How much weather stripping is needed to surround the outer edge of the window
(to nearest tenth of foot)?
Choose:
 18.0' 19.7' 24.4' 33.8' b) How much plastic covering is needed to cover the window, following the outline of the window?
Choose:
 25.2 sq. ft. 42.0 sq. ft. 21.5 sq. ft. 36.7 sq.ft.

9.
A length of green ivy with shamrocks is to be placed around the outer edge of a clock as decoration for St. Patrick's Day. If the clock has a radius of 9 inches, how many inches, to the nearest inch, of the ivy will need to be purchased?
Choose:

 28 inches 29 inches 56 inches 57 inches 10.
A semicircle has a radius of 12 inches.
a) Find, to the nearest inch, the number of inches around the outside of this red semicircular shaped figure.

Choose:

 87 inches 75 inches 62 inches 38 inches b) Find, to the nearest square inch, the area of this red semicircular shaped figure.
Choose:

 113 sq.in. 226 sq.in. 342 sq.in. 452 sq.in.

11.
This is a right triangle inscribed in a circle and the hypotenuse of the triangle is the diameter of the circle.
a) Find the circumference of the circle.

Choose:

 2.5π 5π 7π 7.5π b) Find the area of the yellow portion of the circle to the nearest tenth of a square unit.
Choose:

 19.6 sq.units 78.5 sq.units 13.6 sq.units 66.5 sq.units 