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Across 3. triangle with all sides equal 6. all the three sides of one triangle are equivalent to the corresponding three sides of the second triangle 8. three angles created at the vertices and together equal 180 degrees 9. any two angles and a non-included side of a triangle are equal to the corresponding angles and non-included side of another triangle 11. the point of intersection of any two sides 12. any side of a triangle, which is perpendicular to its height or altitude 14. The sum of the measures of these two angles equals the measure of the exterior angle that does not share their vertices 15. the hypotenuse and one of the legs of one right triangle are congruent to the hypotenuse and corresponding leg of another right triangle

Down 1. A triangle with two equal sides 2. geometric figures that have equivalent corresponding sides as well as corresponding angles 4. an angle between one side and the extension of an adjacent side 5. any two angles and their included side of one triangle are equivalent to the corresponding two angles and included side of a second triangle 7. triangle with three equal interior angles 10. either of the angles of a triangle that have one side in common with the base. 13. angle between two sides of a triangle