Similar Triangles

Triangle XYZ is shown.

Which triangle must be similar to triangle XYZ ?
​A.)  a triangle with two angles that measure 40°
B.)  a triangle with angles that measure 40° and 60°
C.)  a scalene triangle with only one angle that measures 100°
D.)  an isosceles triangle with only one angle that measures 40°
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Two triangles are similar if their corresponding angles are congruent and the corresponding sides are
​in proportion.

If a triangle was to be similar to triangle XYZ, it would surely have equal angles.  If two angles on the new triangle 
measured 40°, each, then the third angle would have to be 100°, since angles of a triangle add up to 180°.  

Therefore, the correct answer would be:
A.)  a triangle with two angles that measure 40°


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