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3. Two wire circles of diameters 28 cm and 35 cm are cut and then joined to form a big circle of radiusk cm. Find the value of k. |
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Answer» Find the circumference of the circle with diameter 28 cm: Circumference = πD = π(28) = 28π cm Find the circumference of the circle with diameter 35 cm: Circumference = πD = π(35) = 35π cm Find the Circumference of the big circle: Total length = 28π + 35π = 63π cm Find the Diameter: Diameter = Circumference ÷π = 63π ÷ π = 63 cm Find the radius: Radius = Diameter ÷2 = 63 ÷2 = 31.5 cm Answer: The radius, k , is 31.5 cm |
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