Question

11. The perimeter of a rectangular park is 56 m. Its length is 16 m. Find its area and the cost of
levelling it at the rate of 2.25 per square metre.​

Answer 1

Answer:

12

Step-by-step explanation:

In this question the perimeter and length of the rectangular pool are given we have to find width of the pool.

( diagram )

The perimeter P of a rectangular is given by formula P=2l+2w where l is the length and w is width of rectangle.

Given that perimeter is 56 meters and length's 16 meters. Substituting values in formula,

⇒56=32+2w

subtract 32 from both sides -

⇒24=2w

w=12

width of rectangular pool is 12 meters.

Hence, the answer is 12.

Answer 2

Step-by-step explanation:

• Perimeter of rectangle = 2(l+b)

2(16+b) = 56m

32+2b = 56m

2b = (56-32)m

b = 12m

• Area of rectangle = l×b

16×12 = 192m²

• cost of levelling field per meter square =₹ 2.25
• cost of levelling 192 m² = 192×2.25 = ₹432