Mathematics, 06.03.2022 06:50 oofoofoof1

Using properties of parallel lines and alternate interior angles, we can show the sum of the interior angles for a triangle is 180°. 1. For △ABC shown above, let line DE, containing vertex C, be parallel to side AB. Since ∠DCE is a straight angle, ∠ECA + ∠DCB + ∠BCA = 180°. Dont answer this :)

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