Question

Which figure has 90° rotational symmetry?

Answer 1

where r the figure?

Answer 2

A figure has rotational symmetry if we can rotate it around its center and get the same figure. For example, if you take a square and rotate it 90 degrees, you still get the same square. We can calculate this 90 degrees by just dividing 360 degrees by 4 (the number of sides). And we say the square has rotational symmetry every 90 degrees (90, 180, 270)
A pentagon (5 sides) has rotational symmetry every 360/5 = 72 degrees
A hexagon (6 sides) has rotational symmetry every 360/6 = 60 degrees
A heptagon (7 sides) has rotational symmetry every 360/7 = 51.4 degrees
An octagon (8 sides) has rotational symmetry every 360/8 = 45 degrees
The figure (3 sides) has rotational symmetry every 360/3 = 120 degrees
Hope that helps you!