Interior angles in a triangle add up to 180 ... First, when a diagonal line is drawn crossing two parallel lines, it forms alternate angles that are equal. That's these two.
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“Alternate Angles”: 25 Photos That Show A Different Side HistoryThe Entrance To It Has Been Closed Since 1916 Image source: babydoll17448 #6 Snoopy, 1988 Macy’s Thanksgiving Day Parade ...
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