The Geometry of Circles Can you pass the test? Use a paper and pencil or calculator to answer these questions.

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Presentation transcript:

The Geometry of Circles Can you pass the test? Use a paper and pencil or calculator to answer these questions.

FORMULAS Remember these formulas when you answer the questions. Diameter = 2 X Radius Circumference = 3.14 X Diameter Diameter = Circumference divided by 3.14 Area = Radius X Radius X 3.14

Radius/Diameter Mom bought a coffee can with a radius of 3 in. Will it fit on a shelf that is 6 in. wide so that the cupboard door will still close?

AREA We own a restaurant. We bought new trays with an area of 300 sq. cm. each. If we buy bowls that have a diameter of 19 cm. each, will they fit on the trays?

Circumference Will our basketball fit through our hoop? The ball has a circumference of 27 in. The hoop has a diameter of 9 in.

AREA We had a yard sale and a man wanted to buy the trampoline if the area was over 700 sq. in. If the diameter is 30 in., will he buy it?

Circumference We need a paper plate big enough to hold a 22 in. circumference chocolate chip cookie. If the plate has a diameter of 7 in., will it fit?

AREA We have a CD with a radius of 6 cm. Can you figure out what its area is?

Circumference We want to know the distance around the barrel lid to help us keep our horse’s circle tight going around the barrel when we race. If the lid’s diameter is 23 in., what is the circumference?

AREA Spongebob needed to know how much food he could fit on his plate without overflowing. If we figure the area using a diameter of 10 in., what is the answer?

ANSWERS 1. Yes, it has a diameter of 6 in. 2. Yes, it has an area of sq. cm. 3. Yes, it has a diameter of 8.59… in. 4. Yes, it has an area of sq. in. 5. No, it has a diameter of … in. 6. The area is sq.cm. 7. The circumference is in. 8. The area is 78.5 sq. in.