Select the correct answer from each drop-down menu. D
4
Points A, B, and C form a triangle. Complete the statements to prove that the sum of the interior angles of AABC is 180°.
given
Statement
Reason
Points A, B, and Cform a triangle.
Let DE be a line passing through B and parallel to AC. definition of parallel lines
23 - 25 and 21 - 24
m_1 = m 4 and m23 = m_5
m24+ m_2 + 25 = 180°
m 1 + m2 + m 3 = 180°
angle addition and definition of a straight line
substitution

Will mark determine whether the conjecture is true or false. give a counterexample for any false conjecture. given: points r, s, and t conjecture: r, s, and t are coplanar. a) false; the points do not have to be in a straight line. b) true c) false; the points to not have to form right angles. d) false; one point may not be between the other two.

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