Question

number.
7. Find the smallest number which must be added to 6412 to make it a perfect square.

8. The area of a square field is 60025 m2. A boy cycles along its boundary at 18 km/h. In how
much time will he return to the starting point?​

Answer 1

Answer:

149 is the least number which must be added to 6412so as to get a perfect square. The required number is6412+149=6561.

8.Area=60025 m square =side^2

Therefore, side of field= 245m

Now, the perimeter or the length of boundary of field= 4*side= 980m

Now, we know that speed=distance/time

But given speed is in km/hr

So, speed in m/s= 18*(1000/3600) =18*(5/18) = 5m/s

Now, speed = distance/ time

So, 5= 980/t

So, time taken= 980/5= 196 seconds

or 3 minutes 16 seconds

Answer 2

Answer:

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