Which fact helps you prove the isosceles triangle theorem, which states that the base angles of any isosceles triangle have equa
l measure? The base angles of an equilateral triangle have equal measure. If two sides of a triangle are equal, the third side must be equal to the others. If a triangle is equiangular, then it is equilateral. If one angle of a triangle is larger than another angle, then the side opposite the larger angle is longer than the side opposite the smaller angle.
d. If one angle of a triangle is larger than another angle, then the side opposite the larger angle is longer than the side opposite the smaller angle.
Rotation, Translation, and Reflection are the 3 rigid motions that preserve angle measure and side length. A dilation only preserves angle measure. Therefore, the answers are A, C, and D
