14
Five-Minute Check (over Lesson 13–2)
Main Idea and Vocabulary
NYS Core Curriculum
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
• equilateral triangle
• scalene triangle
• acute triangle
• right 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.
1. A
2. B
3. C
4. D0% 0%0%0%
A. 2; yes
B. 2; no
C. none; yes
D. none; no
Measure to find the number of congruent sides. Then state whether any of the sides appear to be perpendicular.
Identify Angles
Triangles form the dome of Spaceship Earth at Epcot Center in Florida. Identify the kind of angles in the triangles.
Answer: There are two acute angles and one obtuse angle.
Draw a triangle like the ones in the photo.
1. A
2. B
3. C
4. D0% 0%0%0%
A. 1 right, 2 acute
B. 1 right, 2 obtuse
C. 3 right
D. 2 acute, 1 obtuse
Identify the kind of angles in the triangles.
End of the Lesson
Five-Minute Check (over Lesson 13–2)
Image Bank
Math Tool Chest
Identify Angles
1. A
2. B
3. C
4. D
0% 0%0%0%
(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. Akil–first, Mateo–second, Gaby–third, Andrea–fourth
C. Andrea–first, Gaby–second, Mateo–third, Akil–fourth
D. Gaby–first, Akil–second, Andrea–third, Mateo–fourth
