Area of a circle is 49 times the area of another
circle with radius 3 cm. Find the radius of the
bigger circle.
Answers
Answered by
50
Answer:
21 cm
Step-by-step explanation:
Area of circle = π*radius²
Let the radius of bigger one be 'r'.
Area of both the circles is same.
=> π(r)² = 49 times of π(3cm)²
=> πr² = 49 * π * 9cm²
=> r² = 49 * 9 cm²
=> r² = 441 cm²
=> r = √441cm²
=> r = 21 cm
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