Write the list word that matches each definition.
1. anything that changes or varies: congruent
2. slanting from one corner to another: vertical
3. corresponding; in agreement or harmony: equilateral
4. having an angle greater than 90: obtuse
5. a law or principle: theorem
6. having symmetry or balance: symmetrical
7. a line touching a curved plane: trapezoid
8. a round object: sphere
9. four-sided figure with two parallel sides: isosceles
10. triangle with two equal sides: tangent
11. triangle with all sides equal: skew
12. instrument for measuring angles: protractor
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