1. Opener: How many diagonals does each polygon have
Opener: How many diagonals does each polygon have? (draw a picture if it will help you)
1.) Square
2.) Octagon
3.) Hexagon
4.) Circle

2. Unit 6: Geometry
Objective: Students will compare and classify triangles by sides and angles

3. Objective: Students will compare and classify triangles by sides and angles Vocabulary:
Equilateral triangle: 3 sides of the same length

4. Isosceles triangle: 2 sides of the same length.
Objective: Students will compare and classify triangles by sides and angles
Isosceles triangle: 2 sides of the same length.

5. Scalene triangle: three sides of different lengths.
Objective: Students will compare and classify triangles by sides and angles
Scalene triangle: three sides of different lengths.

6. Objective: Students will compare and classify triangles by sides and angles Classify the triangle by its sides:
6cm
6cm
8 in
5 in
6cm
5 in
7in
6in
5in

7. Objective: Students will compare and classify triangles by sides and angles Classify the triangles by its sides:
1.) 12in, 3in, 3in
2.) 9cm, 9cm, 9cm
3.) 14m, 7m, 14m
4.) 3in, 6in, 7in

8. Objective: Students will compare and classify triangles by sides and angles Vocabulary:
Acute triangle: has three acute angles

9. Right triangle: has one right angle
Objective: Students will compare and classify triangles by sides and angles
Right triangle: has one right angle

10. Obtuse triangle: has one obtuse angle
Objective: Students will compare and classify triangles by sides and angles
Obtuse triangle: has one obtuse angle

11. Equiangular triangle: all three angles are equal
Objective: Students will compare and classify triangles by sides and angles
Equiangular triangle: all three angles are equal

12. Objective: Students will compare and classify triangles by sides and angles Classify the triangle by its angles:
60°
60°
60°
100°
45°
35°

13. Objective: Students will compare and classify triangles by sides and angles Classify the triangles by its angles:
1.) 45°, 45°, 90°
2.) 136°, 24°, 20°
3.) 75°, 50°, 55°
4.) 45°, 76°, 59°

14. The sum of the angle measures of a triangle is 180°.
Objective: Students will compare and classify triangles by sides and angles Sum of Angle Measures of a Triangle
The sum of the angle measures of a triangle is 180°. A B C

15. Objective: Students will compare and classify triangles by sides and angles Tell whether the angle measures are those of a triangle. If so, classify the triangle as acute, right, obtuse or equiangular.
1.) 90°, 35°, 56°
2.) 75°, 60°, 45°
3.) 120°, 23°, 37°
4.) 100°, 25°, 35°

16. Objective: Students will compare and classify triangles by sides and angles Find the value of x. Remember that all triangles add up to 180°
1.)
2.)
50°
70 °
65° x X X
3.)
40 °
65 °

17. Objective: Students will compare and classify triangles by sides and angles Word Problem:
The end of a roof is in the shape of an isosceles triangle. The measure of an angle at the peak, between the two equal sides, is 120°. The other two angle measures are equal. What is their measure?

18. Homework:
Workbook page problems 1-17