Answer:
8. B-Definition of Perpendicularity
9. D-Definition of Congruent Angles
10. C-Triangle Inequality Theorem 3 (S1+S2=S3)
Step-by-step explanation:
8. Definitions of perpendicularity. the quality of being at right angles to a given line or plane (especially the plane of the horizon) type of: oblongness, rectangularity. the property of being shaped like a rectangle. the relation of opposition between things at right angles.
9. Congruent angles are angles that have the same measure.
10. The sum of the lengths of any two sides of a triangle is greater than the length of the third side.
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