Question

`The sum of the triangles of an equilateral triangle is 2 cm.Increase in area increased by 243 sq.ft. TheWhat is the length of each arm of that triangle?2) 3 cm1) 1 cm3) 3 cm4) (2 + 73) cm`​

Answer 1

Step-by-step explanation:

Let original length =a

New length =a+2

Then area =

4

3

a

2

New area =

4

3

a

2

+2

3

∴

4

3

(a+2)

2

-

4

3

a

2

= 2

3

(a+2)

2

−a

2

=8

4a+4=8

a=1cm