Question
Perimeter of a square and circumference of a circle are
in the ratio 7:11, respectively. If area of the square is 49 cm2, then find the radius of the circle. (Take π = 22/7)Solution
Let the perimeter of the square and circumference of the circle be ‘7x’ cm and ‘11x’ cm, respectively. Area of square = a2 (Where ‘a’ is the side of the square) ATQ; 49 = a2 Or, a = 7 cm So, perimeter of the square = 7 × 4 = 28 cm So, circumference of circle = 28 × (11x/7x) = 44 cm Circumference of circle = 2πr (Where ‘r’ is the radius) So, 44 = 2 × (22/7) × r Or, r = 7 cm Therefore, radius of the circle is 7 cm.
What will come in place of the question mark (?) in the following series?
4000, ?, 320, 192, 153.6, 153.6
5   3   4   7.5   17    ?    138
24  12  18  ?  157.5  708.75  3,898.125
Find the missing number in the given number series.
98, 89, 114, 50, 194, ?
- What will come in place of the question mark (?) in the following series?
-5, -2, ?, 10, 19, 30 188    178    158   ?     88    38
1290, 1225, 1175, ?, 1112, 1095, 1085
Find the missing number in the given number series.
2, 7, 19, 62, ?, 1270Â
64, 80, 120, 210, ?, 945
216, 81, 297, 378, ?, 1035, 1728
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