An aeroplane flying horizontally at a height of 2500m above the ground is observed at an elevation of 60°.After 15 seconds,the elevation is observed to be 30°.Find the speed of the aeroplane in km per hour?
Find the square root of each of the following numbers by Division method.
(i) 2304 (ii) 4489 (iii) 3481 (iv) 529
(v) 3249 (vi) 1369 (vii) 5776 (viii) 7921
(ix) 576 (x) 1024 (xi) 3136 (xii) 900