Q.7] If the area of the circle is 66sq.cm,find the diameter of the circle.
Answers
Answered by
0
Answer:
66
Step-by-step explanation:
Using the formulas
A=πr2
d=2r
Solving ford
d=2A
π=2·66
π≈9.167
Answered by
1
Answer:
2√21 cm
Step-by-step explanation:
Area of a circle = πr^2
66 = 22/7 × r^2
r^2 = 66 × 7/22
r^2 = 3 × 7
r^2 = 21. (Since, r = d/2)
(d/2)^2 = 21
d^2 / 4 = 21
d^2 = 21 × 4
d = √ 21 × 4
d = 2√21 cm
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