9.1.2 Developing Formulas for Circles and Regular Polygons − Worksheet
Example 1: Find each measurement. 1. the circumference of C
2. the area of A in terms of π
3 x in.
C 10
A
cm π
3. the circumference of P in which A = 36 π in 2
Example 2: 4. A pizza parlor offers pizzas with diameters of 8 in., 10 in., and 12 in. Find the area of each size pizza. Round to the nearest tenth.
Example 3: Find the area of each regular polygon. Round to the nearest tenth. 5. 6.
3 cm
10 in.
7. an equilateral triangle with an apothem of 2 ft
8. a regular dodecagon with a side length of 5 m
125
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