Question

a. An equilateral triangle of side 15 cm.​

Answer 1

Perimeter of this equilateral triangle is,
PERIMETER =3*side
=3*15
=45cm

Answer 2

Answer:

$area \: of \: equilateral \: triangle = \frac{ \sqrt{3} }{4} {side}^{2}$

$= \frac{ \sqrt{3} }{4} \times 15 \times 15$

$= \frac{225 \sqrt{3} }{4}$

$= 97.31cm {}^{2}$

follow me on brainly