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Name Geometry 5.G.3, 5.G.4 Lesson 3 Classify Triangles eHelp Homework Helper Need help? connectED.mcgraw-hill.com There is a large pyramid standing in front of the Louvre museum in Paris, France. The sides of the pyramid are shaped like triangles. Classify the red triangle based on its angles. There are three acute angles. So, the triangle formed by the side of the pyramid is an acute triangle. Practice 1. Determine the number of congruent sides. Then classify the triangle based on its sides. 3.1 cm 1.4 cm 2.7 cm Copyright © The McGraw-Hill Companies, Inc. Andrew Ward/Life File/Photodisc/Getty Images How many sides of the triangle are congruent? The triangle is a . Vocab Vocabulary Check Fill in each blank with the correct term(s) or number(s) to complete each sentence. 2. An equilateral triangle is a triangle with congruent sides. 3. An acute triangle is a triangle with less than angles each . 4. An obtuse triangle is a triangle with one angle that is greater than . Lesson 3 My Homework919 Problem Solving 5. Look at the triangle on the top of the White House in the photo. Describe the sides and angles of the triangle. 6. Serena has an art easel with sides of equal length. She opened the easel and placed it on her desk. Classify the type of triangle formed by the easel and the desk according to its sides. Next, classify the type of triangle formed by the easel and the desk according to its angles. 7 7. Identify Structure The image 3 8. Justify Conclusions A triangle has two sides that are perpendicular. Could the triangle be isosceles, equilateral, or scalene? Explain. Test Practice 9. Which of the following figures is an obtuse triangle? A B 920Need more practice? Download Extra Practice at C D connectED.mcgraw-hill.com Copyright © The McGraw-Hill Companies, Inc. (t)Brand X Pictures/PunchStock, (c)Purestock/Getty Images shown at the right contains many triangles. Describe the different types of triangles found in the image.