Set 1
Set 2
100
A circle has a radius of 30 cm. Which of these is closest to its area?
A.188 cm^2
B. 11,310 cm^2
C. 94 cm^2
D. 2,827 cm^2
D!
100
Select ALL true statements!
A. pi is the area of a circle with a diameter of 1.
B. pi is the area of a circle with a radius of 1.
C. pi is the circumference of a circle with a radius of 1.
D. pi is the circumference of a circle with a diameter of 1.
E. pi is the constant of proportionality relating the radius of a circle to its area.
F. pi is the constant of proportionality relating the diameter of a circle to its circumference.
B,D,F
200
A class measured the radius and circumference of various circular objects. The results are plotted on the graph. Does there appear to be a proportional relationship between the radius and circumference of the circle? EXPLAIN.
Yes!! If you divide each circumference by it's radius, you get the numbers 6, 6.25, about 6.33, and about 6.29. These numbers are close enough to show proof of a proportional relationship.
200
For each quantity, decide whether circumference or area would be needed to calculate it. EXPLAIN!!
a. The distance your car will go with one rotation of the wheels
b. The amount of oil it takes to cover the bottom of a frying pan
a. Circumference, the distance the car goes in one rotation is the distance around the tires.
b. Area, the pan is circular and the entire circular surface is being covered in oil.
300
This figure is made from part of a circle and part of a square. What is the area of this figure to the nearest square unit?
95 square units
300
The shape is composed of semi-circles and squares. Select ALL the expressions that represent its perimeter
A. 10 + 10 + 10pi + 10 + 10 + 10pi
B. 120 + 20pi
C.40 + 20pi
D. 80 + 10pi
A and C