Pages 180–181 Check for Understanding 1. Triangles are classified by sides and angles. For example, a triangle can have a right angle and have no two sides congruent. 2. Sample answer: 3. Always; equiangular triangles have three acute angles. 4. Never; right triangles have one right angle and acute triangles have all acute angles. 5. The triangle has one angle with measure greater than 90, so it is an obtuse triangle. 6. The triangle has three congruent angles, so it is an equiangular triangle. 7. n MJK is obtuse because m / MJK . 90. n KLM is obtuse because m / KLM 5 m / MJK and m / MJK . 90. n JKN is obtuse because m / JNK 5 180 2 m / JNM 5 180 2 52 or 128. n LMN is obtuse because m / LNM 5 180 2 m / JNM 5 180 2 52 or 128. 8. n GHD is a right triangle because G w H w ' D w F w so / GHD is a right angle. n GHJ is a right triangle because G w H w ' D w F w so / GHJ is a right angle. n IJF is a right triangle because I w J w i G w H w , G w H w ' D w F w so I w J w ' D w F w and / IJF
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This note was uploaded on 12/19/2011 for the course MAC 1140 taught by Professor Dr.zhan during the Fall '10 term at UNF.