WARM UP 1)Find the area of an equilateral triangle with radius 2)Find the area of a regular hexagon with perimeter 72. 3)Find the area of a square with.

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Presentation transcript:

WARM UP 1)Find the area of an equilateral triangle with radius 2)Find the area of a regular hexagon with perimeter 72. 3)Find the area of a square with apothem 5.

Section 11.5 Circumferences and Areas of Circles

Circumference

AREA of a CIRCLE

Find the circumference of a circle with an area of 72π. A = 72π

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If a bicycle tire has a diameter of 26 inches, how far does it travel in 1000 revolutions of the tire? HINT: You need to use circumference! This is one revolution ·1000 = 81,680 inches

Pizza – my favorite If 6 oz are needed to make an 8-inch pizza, how much dough will be needed to make a 16-inch pizza? Hint: compare the areas!

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Cool Circumference Video