4-1
Exercises
KEYWORD: MG7 4-1
KEYWORD: MG7 Parent
GUIDED PRACTICE
Vocabulary Apply the vocabulary from this lesson to answer each question.
1. In △JKL, JK, KL, and JL are equal. How does this help you classify △JKL by
its side lengths?
2. △XYZ is an obtuse triangle. What can you say about the types of angles in △XYZ?
SEE EXAMPLE
1
p. 216
Classify each triangle by its angle measures.
3. △DBC
4. △ABD
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2
p. 217
7. △EFH
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8. △HFG
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3
p. 217
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SEE EXAMPLE
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Classify each triangle by its side lengths.
6. △EGH
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5. △ADC
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SEE EXAMPLE
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Multi-Step Find the side lengths of each triangle.
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SEE EXAMPLE 4
p. 218
11. Crafts A jeweler creates triangular earrings by bending
pieces of silver wire. Each earring is an isosceles triangle
with the dimensions shown. How many earrings can be
made from a piece of wire that is 50 cm long?
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PRACTICE AND PROBLEM SOLVING
Independent Practice
For
See
Exercises Example
12–14
15–17
18–20
21–22
1
2
3
4
Extra Practice
Skills Practice p. S10
Application Practice p. S31
Classify each triangle by
its angle measures.
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12. △BEA
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13. △DBC
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14. △ABC
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15. △PST
16. △RSP
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17. △RPT
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Multi-Step Find the side lengths of each triangle.
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20. Draw a triangle large enough to measure. Label the vertices X, Y, and Z.
a. Name the three sides and three angles of the triangle.
b. Use a ruler and protractor to classify the triangle by its side lengths
and angle measures.
4-1 Classifying Triangles
219