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M cdb = 90 definition ofright angles 3. ∠aec is a right angle ∠bed is a right angle. Since aoc = bod, and boc = boc (reflexive property), aob = cod (subtraction property) (if congruent angles are subtracted from congruent angles, then the differences are congruent) 4) since lp Angles on a straight line add to 180°.
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Having a good understanding of the following topics will help with proof: B + 90° + 65° = 180°. B + 155° = 180°. Students will determine if a given pair of triangles is similar.
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