For the figure, determine whether each statement is true or false. If a statement is true, explain why.
(a) ?1 = 90°.
(b) ?1 = ?5 + ?11.
(c) ?9 + ?10 = ?2(?5).
(d) ?5 + ?6 = ?1.
(a) False
(b) True: The exterior angle equals the sum of the non adjacent interior angles.
(c) False
(d) True: Alternate interior angles are congruent.
Mathematics
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