Question

Plz plz answer this one

Answer 1

If each side of a triangle is doubled, then the height doubles as well.

Let A be it's initial area.
New area =1/2 *2b *2h, which is 4 times the initial area of the triangle.

Therefore increase in area = 4A - A = 3A

Percentage increase
= 3A/A*100
= 300%

Hope it helps :)

Answer 2

supposed triangle be equilateral triangle
with side=x

$area \: of \: equilateral \: triangle = \ \frac{ \sqrt{3} }{4} {x}^{2}$
now when side became double then area will be=
$\frac{ \sqrt{3} }{4} (( {2x})^{2} ) = \sqrt{3} {x}^{2}$
now,
subtact A2 by A1
then we get SE as given below
$\frac{3 \sqrt{3} }{4} {x}^{2}$
now find its percentage
percentage =A3/(A1+A2) ×100