Question
The circumference of a semi-circle is 108 cm. What is
the area of the circle with the same radius as the semi-circle? (Take π = 22/7)Solution
Circumference of a semi-circle = (π × radius) + (2 × radius) = {(22/7) + 2} × radius Or, (36/7)× radius = 108 Or, radius = 108 × (7/36) So, radius = 21 cm So, area of the circle with same radius = π × radius2 = (22/7) × 21 × 21 = 1386 cm2
1056Â Â Â Â Â 264Â Â Â Â Â Â 132 Â Â Â Â Â Â 33Â Â Â Â Â Â ? Â Â Â Â Â Â 4.125
...What should come in place of (?) question mark in the following number series.
7, 14, 30, 66, 146, ?
16Â Â Â 25Â Â Â 36Â Â Â 49Â Â Â 64Â Â Â Â ?
What will come in place of the question mark (?) in the following series?
63, 92, ?, 158, 195, 224
306, 272, 240, ?, 182, 156
33Â Â Â 41Â Â Â 25Â Â Â 49Â Â Â 17Â Â Â Â ?
6    11    32    111    ?   2345   14100
...5, 12, 24, 36, 52, ?
312, 302, 282, ?, 212, 162
What value should come in the place of (?) in the following number series?
1.5, 2.5, 4, 6, ?, 11.5
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