5 4 inequalities for sides and angles of a triangle
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5:4 Inequalities for Sides and Angles of a Triangle. Objective: Recognize and apply relationships between sides and angles of triangles. C. EX. 7. 12.

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5:4 Inequalities for Sides and Angles of a Triangle

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5 4 inequalities for sides and angles of a triangle

5:4 Inequalities for Sides and Angles of a Triangle

Objective: Recognize and apply relationships between sides and angles of triangles


5 4 inequalities for sides and angles of a triangle

C

EX.

7

12

Theorem:If one side of a triangle is longer than another side, then the angle opposite the longer side has a greater measure than the angle opposite the shorter side.

B

A

9

List the angles from greatest

to least.


5 4 inequalities for sides and angles of a triangle

EX:

D

35°

Theorem: If one angle of a triangle has a greater measure than another angle, then the side opposite the greater angle is longer than the side opposite the lesser angle.

55°

E

F

List the sides from shortest

to longest.


Example

EXAMPLE

  • Which is greater, mCBD or mCDB?

  • Is mADB> mDBA?

  • Which is greater, mCDA or mCBA?

C

15

D

16

8

12

A

10

B


Practice

PRACTICE

  • Name the angle with the least measure in ▲LMN.

  • Which angle in ▲MOT has the greatest measure?

  • Name the greatest of the six angles in the two triangles, LMN and MOT.

L

10

N

7

6

M

9

5

O

8

T


Example1

EXAMPLE

1. Which side of ▲RTU is the longest?

2. Name the side of ▲UST that is the longest.

3.

T

30º

110º

R

U

S


Practice1

PRACTICE

1. What is the longest segment in ▲CED?

2. Find the longest segment in ▲ABE.

3. Find the longest segment on the figure. Justify your choice.

4. What is the shortest segment in BCDE?

5. Is the figure drawn to scale? Explain.

A

E

55º

D

50º

30º

100º

40º

C

B


Exit ticket

Exit Ticket

  • Find the value of x and list the sides of ∆ABC in order for SHORTEST to LONGEST if the angles have the indicated measures.

    m∠A = 12x - 9, m∠B = 62 – 3x ,

    m∠C = 16x + 2


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