Question

Identify the shape that has 2 lines of symmetry, as well as the order of rotational symmetry, is 2.

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

The line which cuts a shape exactly into two halves is called the line of symmetry.

Lines of symmetry:

1. Triangle: Vertical line through centre; 1
2. Rhombus: Vertical and horizontal lines through centre; 2
3. Trapezium: Vertical line through centre; 1
4. Square: Vertical and horizontal line through the centre and 2 diagonals; 4

In a complete turn of ${360}^{\circ }$, the number of times an object looks the same is called the order of rotational symmetry.

Order of rotational symmetry:

1. Triangle: 120${}^{\circ }$, 240${}^{\circ }$, 360${}^{\circ }$; order 3
2. Rhombus: 180${}^{\circ }$, 360${}^{\circ }$; order 2
3. Trapezium: 360${}^{\circ }$; order 1
4. Square: 90${}^{\circ }$, 180${}^{\circ }$, 270${}^{\circ }$, 360${}^{\circ }$; order 4