Mathematics, 21.01.2020 05:31 kirinaallison

If angle 8 is congruent to angle 10 and angle 1 is congruent to angle 7, which describes all the lines that must be parallel? lines r and s are crossed by lines t and u to form 16 angles. clockwise from top left, at the intersection of r and t, the angles are 1, 2, 3, 4; at the intersection of s and t, 5, 6, 7, 8; at the intersection of u and s, 9, 10, 11, 12; at the intersection of u and r, 13, 14, 15, 16.

a. only lines r and s must be parallel.

b. only lines t and u must be parallel.

c. lines r and s and lines t and u must be parallel.

d. neither lines r and s nor lines t and u must be parallel.

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If angle 8 is congruent to angle 10 and angle 1 is congruent to angle 7, which describes all the lin...