Question

which statement describes the order of rotational symmetry for an isosceles triangle? an isosceles triangle has an order 0 rotational symmetry because there is no angle at which it can be rotated onto itself. an isosceles triangle has an order 1 rotational symmetry because it does not have all congruent angles. an isosceles triangle has an order 2 rotational symmetry because it has 1 pair of congruent angles. an isosceles triangle has an order 3 rotational symmetry because it has 3 angles.

Explanation:

The order of rotational symmetry of a shape is the number of times it can be rotated around a central point and still look the same. An isosceles triangle looks the same as its original form only when rotated by 360° (a full - turn). Rotating it by any other angle less than 360° will not result in it looking the same as the original. So, its order of rotational symmetry is 1.

Answer:

B. An isosceles triangle has an order 1 rotational symmetry because it does not have all congruent angles.