Question

Find the length of a rectangular park if its breath is 15 cm and area is 375 square cm and perimeter is 80 CM
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Answer 1

Explanation:

Let the length be l m and the breadth be b m.

Then the area would be lb=400

Perimeter would be 2(l+b)=80

lb=400

⇒2(l+b)=80

⇒l+b=40

∴b=40−l --(1)

Substituting (1) in Area, we get

⇒l(40−l)=400

⇒40l−l

2

=400

⇒l

2

−40l+400=0

⇒(l−20)(l−20)=0

∴l=20

has equal roots, so it is possible to design the rectangle of given parameters.

⇒b=40−20=20

Answer 2

Answer:

Perimeter of rectangle = 2 (l+b)

80= 2 (l+15)

80 divided by 2 = L + 15

40 = L + 15

40-15 = 25

therefore length is 25.

Hope it helps!!!