Question
The area of a circle is nine times its circumference
(numerically). What is the diameter of the circle?Solution
ATQ,
Circumference = 2 × π × r
Area = π × r²
Let radius = r units
Then, π × r² = 9 × 2 × π × r
⇒ r² = 18r
⇒ r = 18
Diameter = 2 × 18 = 36 units
More Circle Questions
What value should come in place of (?) in the given expression.
450 ÷ 9 + 75% of 160 − 64 ÷ 4 = ?
2/5 of 3/4 of 7/9 of 14400 = ?
7/3 of 4/5 of 15/56 of ? = 83
[564 + 32 of 18 × 9 ÷ 12 + 162 ] ÷ 4 = ?
What should come in place of (?) question mark in the given expression.
 (25% of 320) + (3/8 of 400) − 30 = ?
45% of 360 - 160 + ? = √324
187 ÷ 5 ÷ 0.4 = ? – 24 × 2.4
Find the simplified value of the following expression:
[{12 + (13 × 4 ÷ 2 ÷ 2) × 5 – 8} + 13 of 8]
18 × 15 + 86 – 58 =? + 38
Â
√(24²+285-8²-172) = ?²
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