Circles Review

Area

250

If the radius is 10.2 mm, what is the area? (use 3.14 for Pi)

326.68mm²

350

The diameter of the circle is 8.5cm what is the area

56.71 cm²

450

if the circumference is 4m what is the area

1.2m2

550

Kevin had a paper circle with the circumference of 15.7in, what would the area be?

19.63in²

650

Clara had a donut with a radius of 6.5cm. the hole in the middle has a diameter of 2.8cm. what is the area of the donut without the hole?

126.51cm²

Circumference

250

If the diameter is 6.8yd what is the circumference

21.352yd

350

The radius is 7in what is the circumference

43.96in

450

If the radius is 64mm what is the circumference

401.92mm

550

If I have a circle with a radius of 9cm what is the circumference

56.52cm

650

Naomi has a music disc with a radius of 21.3 cm. She wants to find its circumference of it. What is the circumference?

133.76cm

Working backwards

250

if the diameter is 6.89m what is the area?

38.24m²

350

if the circumference is 78.46cm, what is the radius? 

12.49cm

450

if the circumference is 36yd what is the radius

5.7yd

550

If the area is 68.41cm² what is the circumference?

29.31cm

650

If you had a semi circle with an area of 19.89in² what would the circumference be of the whole circle?

11.17in

Word problems

250

Jake has 12 pumpkins if he puts all the pumpkins in a circle the circumference is 48.6cm what is the diameter

15.47cm

350

Lexi has 5 circular Balloons, if the diameter for them is 2 what is the area of each balloon

3.14

450

Maria and Jamie each made a circle shaped cake. Maria made one with a radius of 6 inches. Jamie made a cake with a diameter of 9 inches. Which one had the greater area? 

Maria with 113.04 inches squared!

550

Leo has a circle with a diameter of 3.4in what is the area

9.07in²

650

Janice drew a snowman on her paper. If the the bottom circle has a radius of 5in, the middle circle has a diameter of 9 in, and the top circle (the head of the snowman) has a radius of 2 in, what is the area of the snowman? Round each time to the hundredths place.

Area= 149.60in²

bottom= 73.5

middle= 63.54

head= 12.56

Fractions

250

If the circle has a radius of 3/4 cm what is the decimal for the circumference

4.71 cm

350

if the circumference is 8.2cm what is the diameter?

2.61cm

450

If the radius of circle is 4 and 8/10 mm what circumference?

30.144mm

550

if the radius is 6 and 20/100mm what is the diameter

12.4mm

650

If the diameter is 78.9mm what is the decimal portion of the area?

.78985