Question

Saira bought a 30m long readymade fence. what is the largest rectangular area she can fence​

Answer 1

first. calculate teh perimeter

30= 2( l+ b )

l+b = 15

here you can take out lenght:

l+b= 15

b=15-l

now area ,

= l×b= l(15-l)

=15l - l^2 m^2______ is the area

when you need max area alway differentiate it:

so it goes like

15- 2l = 0

l= 7.5 m

now breadth is b= 15- l

b= 15- 7.5=7.5m

now put the values ,

area= l× b

7.5× 7.5= 56.25m ^2

hope it helps you

good night

Answer 2

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ans is 56.26