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Classifying TrianglesReference pages p.484-488

E.Q How do you classify triangles and find the

interior and exterior angle measures?

Angles Sides

Acute Equilateral

Right Isosceles

Obtuse Scalene

- Page 486 Textbook

Angle Measures-No picture

- 25º, 125º, 30º
- 30º, 60º, 90º
- 47º, 56º, 77º

Side Measures-No picture

- 8m, 11m, 8m
- 5cm, 5cm, 5cm
- 7 in, 9 in, 13in

All triangles have an angle sum of.

60

60

60

X

70

50

120

T

30

Mental Meltdown

- Find the missing angle
- 30, 60, ?
- 60, 80, ?
- 90, 19, ?
- 47, 99, ?
- 50.3, 60.9, ?
- 62 1/3, 74 3/8, ?
- Demonstrate an obtuse angle.

Supplementary Angles

- Supplementary angles are adjacent angles that

_______. - If we know the measure of one angle in a

supplementary angle pair, then we can find the

angle of the other.

x

75

42

55

x

80

y

100

45

35

42

x

y

48

3-2-1

- 3 ways to classify a triangle by angles,
- 2 ways to classify a triangle by sides,
- and 1 way to determine a missing interior angle.