Transcript over Lesson 13–2

Five-Minute Check (over Lesson 13–2)
Main Idea and Vocabulary
Key Concept: Classify Triangles by Sides
Example 1: Identify Sides
Key Concept: Classify Triangles by Angles
Example 2: Identify Angles
Identify Angles
• I will identify characteristics of triangles.
• isosceles triangle
• acute triangle
• equilateral triangle
• right triangle
• scalene triangle
• obtuse triangle
Identify Sides
Measure to find the number of
congruent sides. Then state
whether any of the sides
appear to be perpendicular.
Write yes or no.
Answer: All of the sides of the triangle have the
same length. So, all 3 sides are
congruent.
No; none of the sides of the triangle
appear to be perpendicular.
Measure to find the number of
congruent sides. Then state whether
any of the sides appear to be
perpendicular.
A. 2; yes
B. 2; no
1.
2.
3.
4.
C. none; yes
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D
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C
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B
D. none; no
A
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A
B
C
D
Identify Angles
Triangles form the
dome of Spaceship
Earth at Epcot Center
in Florida. Identify the
kind of angles in the
triangles.
Draw a triangle like the
ones in the photo.
Answer: There are two acute angles and
one obtuse angle.
Identify the kind of angles in
the triangles.
A. 1 right, 2 acute
B. 1 right, 2 obtuse
C. 3 right
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A
B
C
D
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D
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B
A
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C
D. 2 acute, 1 obtuse
1.
2.
3.
4.
End of the Lesson
Five-Minute Check (over Lesson 13–2)
Image Bank
Math Tool Chest
Identify Angles
(over Lesson 13–2)
Solve. Use the logical reasoning strategy.
Andrea, Gaby, Mateo, and Akil raced in the hundred meter
dash. Use the following clues to determine the order of
the runners at the finish line.
1. Mateo could not catch up with Gaby or Akil.
2. Andrea did not come in second or third.
3. Gaby pulled ahead of Akil right at the finish line to take
first place.
A. Gaby–first, Akil–second, Mateo–third, Andrea–fourth
B.
1.
A
Akil–first, Mateo–second, Gaby–third, Andrea–fourth
2.
3.
4.
B
C
D
C.
Andrea–first, Gaby–second, Mateo–third, Akil–fourth
D.
Gaby–first, Akil–second, Andrea–third, Mateo–fourth
0%
D
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C
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B
A
0%