A Certain number has exactly eight factors including 1 and itself. Two of the factors are 21 and 35. What is the number
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Question :
The diagonal of a rectangular field is 15 m and its area is 108 sq. m. What will be the total expenditure in fencing the field at the rate of 5 per metre ?
Area of Rectangle = Length * Breadth = 108 ---> 1
Diagonal = 15
⇒ \sqrt{l^2 + b^2} = 15
l
2
+b
2
=15
⇒ l^2 + b^2 = 15^2
⇒ l^2 + b^2 = 225
⇒ ( l + b)^2 = l^2 + b^2 + 2 lb = 225 + 2 * 108
⇒ 441
⇒ l + b = 21
Finding Perimeter of rectangle
⇒ 2(l + b)
⇒⇒2 * 21
⇒ 42 m
Finding total Cost
⇒ 42 * 5
⇒ Rs. 210
Therefore , the total Expenditure in fencing the field at the rate of 5 per metre is Rs. 210
todige2000:
this is not the correct answer
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