Question

Which statement describes the order of rotational symmetry for an isosceles triangle?

A. An isosceles triangle has an order 0 rotational symmetry because there is no angle at which it can be rotated onto itself.
B. An isosceles triangle has an order 1 rotational symmetry because it does not have all congruent angles.
C. An isosceles triangle has an order 2 rotational symmetry because it has 1 pair of congruent angles.
D. An isosceles triangle has an order 3 rotational symmetry because it has 3 angles.

Answer 1

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

Explanation:

just did it on edge

Answer 2

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

Explanation:

An isosceles is a triangle that has two sides of equal length.

The isosceles theorem says that the angles opposite to the equal sides of a triangle are equal.

Thus, it also has two equal angles and one non equal angle. Thus, it does not have all congruent angles.

• The order of rotational symmetry of a figure is the number of times we rotate up to 360° the figure such that it looks exactly the same as the original figure.

When we rotate the isosceles triangle up to 360° , only 1 time it looks exactly same as in the beginning because at each rotation the order of angles changes.

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