Symmetries in Shapes — Quiz

Question 4 • Geometry

For which shape is 180 degrees the smallest angle of rotational symmetry?

Answer

Image with description A block figure arrow pointing down. There is a dot in the center.

Image with description A block figure 5-pointed star. There is a dot in the center.

Image with description A block figure that looks like a circle with a diagonal line through it. There is a dot in the center.

Image with description A block figure dodecagon that looks like a plus sign. There is a dot in the center.

Explanation

A full turn is 360°, so a shape has 180° rotational symmetry if it matches itself after a half-turn. The circle with a diagonal line through it matches after 180° because the circle stays the same and the line lies on itself. The five-pointed star and plus-shaped figure match at smaller angles, while the downward arrow does not match after a half-turn.

AI-written and checked against the verified answer.

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