How do you find the circumference of a circle? Finding Circumference.

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Presentation transcript:

How do you find the circumference of a circle? Finding Circumference

EXAMPLE 1 Find the circumference of the circle to the nearest hundredth. Use 3.14 for. Step 1: Determine which formula you will use. Step 3: Substitute the values you know. Step 4: Use order of operations to solve Step 2: Write it down! C = d C = (3.14)(9) C = in.

EXAMPLE 2 Step 1: Determine which formula you will use. Step 3: Substitute the values you know. Step 4: Use order of operations to solve Step 2: Write it down! C = 2 r C = 132 ft. A circular wading pool at a park has a radius of 21 feet. Find the circumference of the pool. Use for. C = 2( )(21)

EXAMPLE 3 A circular concrete patio has a circumference of about 1,000 feet. A gardener placed a palm tree in the center. How far is the tree from the edge of the patio to the plant at the center? C = 1,000 ft Step 1: Determine which formula you will use. Step 3: Substitute the values you know. Step 4: Use your mad algebra skills to solve for r ! Step 2: Write it down! C = 2 r C = ft = 2(3.14)r 1000 = 6.28r 6.28 = r

CIRCUMFERENCE RACE 1. a circle with diameter 14 mmabout 44 mm Use 3.14 or for. Round to the nearest hundredth, if necessary. 2. a circle with radius 5 in.about in.

How do you find the circumference of a circle? Sample answer: Use C = d or C = 2 r, where C is the circumference, d is the diameter, and r is the radius. Use 3.14 for.