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Classification of angles according to sides?
Triangles can be classified either according to their sides or according to their angles. All of each may be of different or the same sizes; any two sides or angles may be of the same size; there may be one distinctive angle. Classification by sides includes equilateral, isosceles, and scalene.
What is never true about a trapezoid?
That all interior angles are equal in size.
When a triangle is enlarged by a factor 3 are the angles tripled in size?
No - if the lengths of the sides are all increased by a factor of 3, the angles remain unchanged. You just wind up with a "similar" triangle 3 times the size of the original. A quick counterexample would be to consider what would happen if the angles DID change. The sum of the angles in the original triangle should be 180°. If the angles in the new, larger triangle tripled in size, the sum of the angles in the bigger triangle would be 540° - but the sum of the angles of a triangle should always remain 180°.
If two parallel lines are cut by a transversal then the alternate exterior angles are?
Then the alternate angles created would be equal in size.
Do the angles of similar figures have the same measure?
Yes. Similar figures are the same shape, but not necessarily the same size; their angles are equal.
