Circumference.

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Finding Circumference

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Presentation transcript:

Circumference

Warm Up Find the area of each figure. Triangle with base 14 in. and height 10 in. Square with sides of 3.5 feet. Rectangle with length 8 1 2 in. and width 6 in. Triangle with base 12.5 m and height 2.4 m.

Complete the table, round to the nearest hundredth. Object Circumference Diameter 𝒄 𝒅 Basketball Rim 56.52 in. 18 in. CD / DVD 37.68 cm 12 cm Coffee Cup 12.56 in. 4 in. Large Pizza 50.24 in. 16 in. Classroom Clock 43.96 in. 14 in. What do you notice about the ratio 𝑐 𝑑 ?

An irrigation sprinkler waters a circular region with a radius of 14 feet. Find the circumference of the region watered by the sprinkler. Use 𝟐𝟐 𝟕 for π.

Find the circumference of the circle to the nearest hundredth.

When is it logical to use 22 7 instead of 3.14 for 𝜋?

A circular pond has a circumference of 628 feet A circular pond has a circumference of 628 feet. A model boat is moving directly across the pond, along a radius, at a rate of 5 feet per second. How long does it take the boat to get from the edge of the pond to the center?

Dante checks the answer to Step 1 by multiplying it by 6 and comparing it with the given circumference. Explain why Dante’s estimation method works. Suppose the model boat were traveling at a rate of 4 feet per second. How long would it take the model boat to get from the edge of the pond to the center?

A circular garden has a circumference of 44 yards A circular garden has a circumference of 44 yards. Lars is digging a straight line along a diameter of the garden at a rate of 7 yards per hour. How many hours will it take him to dig across the garden?