1. If the diagonal of a square is d...
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1. If the diagonal of a square is doubled, then area of the square becomes (a) 2 times (b) 3 times (c) 4 times (d) 6 times 2. V.05x.5x a = .5 x..05 x VT then =? (a) 0.0025 (b) 0.025 (c) 0.25 (d) None of these. 3. 12401 = 17* , then the value of x is (2) 3 (6) 4 (c) 5 (d) 6. 4. Find the value of a + 2(b + 2), if b = 1, c = 3 and a = 2 is (2) 24 (b) 13 (c) 20 (d) 30 5. The least square number exactly divisible by 8, 12, 15 and 20 is (a) 900 (b) 1200 (c) 3600 (d) 14400

11th - 12th Class
Maths
Solution
129
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(1) As we know that area of square ( =frac{d^{2}}{2} ) Where ( d= ) length of digand ( therefore A propto d^{2} ) If diagonal of the square is doubled then area becomes 4 times. Q) ( sqrt{0.05 times 0.5 times 9}=50 ) ( 2 sqrt{0.05 times 0.5 times 9}=0.5 times 0.05 times sqrt{6} ) ( Rightarrow sqrt{0.05 times 0.05 times sqrt{a}}=0.5 times 0.05 times sqrt{6} ) ( Rightarrow 9 / 6=0.5 times 0.05=0.025 )
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