Question

The side of an equilateral triangle is shown by $l$. Express the perimeter of the equilateral triangle using $l$.
(3 marks)

Answer 1

An equilateral triangle is a triangle with three equal sides.
(1 mark)

Given, side of the equilateral triangle = $l$

Perimeter is the total sum of lengths of all the bounding sides of a planar object.
(0.5 mark)

$\therefore$ The perimeter of an equilateral triangle = $3\times sidelength$ = $3l$
(2 mark)