Geometry

Question Analysis:

This question involves the concept of right angles in a geometric figure. The main focus is to identify which pair of line - segments form a 90 - degree angle.

Key Concept Explanation:

A right angle is an angle that measures exactly 90 degrees. In a geometric figure, when two line - segments meet at a vertex and the angle between them is 90 degrees, they form a right angle.

Step-by-Step Solution:

1. Analyze each option:

A.For “Line Segments NT and ND”: At vertex N, the angle ∠TND is marked with a right - angle symbol, which means the measure of ∠TND is 90 degrees. So, NT and ND form a right angle.

B.For “Line segments ZT and TN”: There is no information to suggest that measurement of the ∠ZTN is 90 degree, so they do not form a right angle.

C.For “Line Segments DR and DN”: The angle ∠RDN is 108 degrees (given in the figure), so they do not form a right angle.

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