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.

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

Step-by-step 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.

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.

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.

60: 45 =12: 9 =4: 3 so the answer is 4: 3