Introduction to Proof Answers

If m∠A = m∠B and m∠A + m∠C = m∠D, thenm∠B + m∠C = m∠D.

4 lines extend from point E. A horizontal line extends to the left to point A and a vertical line extends up to point C. Another line extends halfway between the other 2 lines to point B. Lines A E and E C form a right angle.

Given that D is the midpoint of AB and K is the midpoint of BC, which statement must be true?

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Which statement is true about the diagram?

The last line of a proof represents

A horizontal line has points D, B, C. A line extends vertically from point B to point A.

A flow chart has 4 boxes. The top box is labeled given and contains angle A is-congruent-to angle B, angle C is congruent to angle B. The second box is labeled symmetric property and contains angle B is-congruent-to angle C. The third box is labeled question mark and contains angle A is congruent to angle C. The fourth box is labeled definition of congruent to angle x and contains m angle A = m angle C.

Segment AB is congruent to segment AB.

Which are correct statements regarding proofs? Select three options.