Circles

Review of the parts!

What is PI?  

The formulas   

CaNoN bAlL!!! Let the games begin!

Rules of the Game: 1) Your group must answer as many questions correctly as possible. You MAY use calculators. 2) At the end of 5 questions, your team will launch cannon balls for every question you have gotten correct. 3) Your team earns points for each cannon ball that hits the given target!

Question 1 The distance around a circle is called its: Diameter Chord Circumference Radius

Question 2 The _____ of a circle is the distance from the center of a circle to a point on the circle. Diameter Chord Circumference Radius

Question 3 The diameter of a circle is Two times the radius Radius + radius Double the radius All of the above

Question 4 The radius of a circle is ______, where d is the diameter of the circle. D2 d/2 2d None of the Above

Question 5 Find the circumference of this pop can lid, given a diameter of 2.2 in.

Question 6 Find the circumference of this vinyl record, given a radius of 6.1 inches.

Question 7 Find the area of the steering wheel with a radius of 7.65 inches.

Question 8 Find the area of the gold medal with a diameter of 9.2 cm.

Question 9 Find the circumference and area of the following circle to the nearest tenth.

Question 10 A sprinkler can spray water 10 feet out in all directions. What area can the water cover?

Question 11 Find the circumference and area of the following circle to the nearest tenth.

Question 12 Find the circumference and area of the following circle to the nearest tenth.

Question 13 A Ferris wheel has a diameter of 50 yards. What distance do you travel in one turn of the wheel?

Question 14 Gears on a bicycle are just circles in shape. One gear has a diameter of 4”, and a smaller one has a diameter of 2”. How much bigger is the circumference of the larger one compared to the smaller one?

Question 15 A manufacturing company is producing dinner plates with a diameter of 12 inches. They plan to put a gold edge on each plate. Which equation could determine how much gold edging the company needs for each plate? 12 x 12 x 22/7 12 x 22/7 6 x 6 x 22/7 6 x 22/7

Question 16 Kira drew a circle with a radius of 20 inches and another circle with a radius of 10 inches. What is the approximate difference between the area of the 2 circles? 300 sq. in 314 sq. in 942 sq. in 1,256 sq. in

Question 17 Brenda wants to attach a string of beads along the circular bottom edge of the lamp shade shown. The diameter of the bottom of the lamp shad is 16 centimeters. About how many centimeters long should Brenda make the string of beads? 25 cm 50 cm 79 cm 201 cm

Question 18 The shape of the outfield fence of a baseball field is that of a quarter circle. The distance from home plate to the wall is 330 feet. What is the length of the circular wall from foul pole to foul pole?

Question 19 Which expression could find the area of the top surface of a circular manhole cover that has a radius of 30 centimeters? 30 x 22/7 30 x 2 x 22/7 30 x 30 x 22/7 15 x 15 x 22/7

Question 20 Find the area of the shaded region.

Question 21 The largest fabric dome in the world, the Millennium Dome covers a circular plot of land with a radius of 160 meters. What is the circumference of the covered land?

Question 22 What is the difference in the area between a square with a base of 4 feet and a circle with a diameter of 4 feet? 16 - 2π square feet 16 – 4π square feet 8π – 16 square feet 16π – 16 square feet

Question 23 What is the difference in perimeter between a square with a base of 4 feet and a circle with a diameter of 4 feet? 8 - 2π square feet 16 - 2π square feet 16 - 4π square feet 16 - 8π square feet

Question 24

Question 25 The base of the sundial shown is a square with a circle inside it. To the nearest square inch, what is the area of the part of the base that is not within the circle?