Question

which figure has exactly four lines of symmetry?
isosceles triangle
regular hexagon
equilateral triangle
square

Explanation:

Step1: Recall line - symmetry of isosceles triangle

An isosceles triangle has 1 line of symmetry.

Step2: Recall line - symmetry of regular hexagon

A regular hexagon has 6 lines of symmetry.

Step3: Recall line - symmetry of equilateral triangle

An equilateral triangle has 3 lines of symmetry.

Step4: Recall line - symmetry of square

A square has 4 lines of symmetry (2 diagonals and 2 lines joining mid - points of opposite sides).

Answer:

square