Welcome! Please take out your homework assignments from yesterday.

- Book assignments on 5.1 and 5.2 and homework packet if you did problems in it.

Go over Test

Can retake after school– Must come in twice

First time - Go over test and study

Second time - Retake test

5.1 Answers

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0

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1. 73 2. 68 3. 110

4. 24 5. 3 x 360 - 180 = 900

6. 3 x 180 - 180 = 360

7. 69 47 116 93

86

8. 30 50 82 28

32 78 118

m x m y m z

m w

m a m b m c m d

m e

m m m n m p m q

m r m s m t

050m u

5.2 answers

1. 79 2. 54

3. 107.5 4.m R=44, mRM=35cm

5. m Y= 76, mRD = 3.5 cm

6. m D = 72, mMD = 10 cm

7. m 124, 56, 56, 38

38, 76, 66, 104

76, 86, 38

m H m G

m OLE

a m b m c m d

m e m f m g m h

m k m n m p

8. 36, 36, 72, 38,

36

m a m b m c m d

m e

9. 10.GAE NAC JAN IEC

19-21 on graph

Warm Ups

Match the triangle description with the most specific name. Side lengths: 5cm, 5cm, 5cm

a) Equilateral

b) Scalene

c) Obtuse

d) Equiangular

e) Isosceles

F) Right

Match the triangle description with the most specific name. Side lengths: 4cm, 4cm, 3cm

a) Equilateral

b) Scalene

c) Obtuse

d) Equiangular

e) Isosceles

F) Right

Match the triangle description with the most specific name. Side lengths: 2cm, 3cm, 4cm

a) Equilateral

b) Scalene

c) Obtuse

d) Equiangular

e) Isosceles

F) Right

Can these segments form a triangle?

1 cm

1 cm

11 cm

No – the two ends will not touch

Can these form a triangle?

4 cm

5 cm

10 cm

No – the ends will not meet

Will this be a triangle?

10 cm

5 cm

5 cm

No. The ends will touch, but they will just form a line segment.

Would this be a triangle?

7 cm

8 cm

10 cm

Yes. The ends will touch and have extra space left over, so it will pop up and make a triangle!

Conjecture 30

The sum of the lengths of any two sides of a triangle is __________ than the length of the third side.

greater

Bridge

Look at the triangles below.

4 cm

3 cm

6 cm

10 cm

2 cm

8 cm

What do you notice about the angles opposite the longest sides?

They are the biggest angles!!!

Look at the triangles below.

4 cm

3 cm

6 cm

10 cm

2 cm

8 cm

What do you notice about the angles opposite the shortest sides?

They are the smallest angles!!!

11 cm

Conjecture 31

In a triangle, the longest side is opposite the angle with the largest measure and the smallest side is opposite the angle with the smallest measure.

Exterior Angle

Adjacent Interior Angle

Remote Interior Angles

Conjecture 32

The measure of an exterior angle of a triangle is equal to the sum of the measures of the remote interior angles.

150o

a

b

Sum of a and b = ??

120o

a

20o

Homework

5.3/ 2-14 even, 16-18, 23-26 (p. 240)