Question

which statement describes the order of rotational symmetry for an isosceles triangle? an isosceles triangle has an order 2 rotational symmetry because it has 1 pair of congruent angles. 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 3 rotational symmetry because it has 3 angles. an isosceles triangle has an order 1 rotational symmetry because it does not have all congruent angles.

Explanation:

Step1: Define rotational symmetry order

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 within a 360 - degree rotation.

Step2: Analyze isosceles triangle

An isosceles triangle can only be rotated 360 degrees to look exactly the same as the original. It does not look the same at any other non - 360 - degree rotation. So the order of rotational symmetry is 1.

Answer:

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