Bell Work

Order the side lengths from least

to greatest.

Order the angle measurements from least to

greatest.

A

B

C65°

62°

53°

A

B

C7 in.

10 in.

9 in.

Note: The figures are not drawn to scale.

<B, <A, <C

AB, AC, and BC

Finding an Angle Measure in a Triangle

Find the value of x in the triangle shown.

26

83 x

We know that:x + 83 + 26 =

180x + 109 = 180 -109 -109 x = 71

So, the value of x is 71°.

You Try

Find the value of x in the triangle shown.

26

92 x

We know that:x + 92 + 26 = 180x + 118 = 180 -118 -118 x = 62

So, the value of x is 71.

You try!

Find the value of x.

A

B

C67°

82°

x°

A

B

C27° 3x°

78°

Note: The figures are not drawn to scale.

x + 82°+ 67°= 180°x + 149 = 180 -149 -149

x = 31°

3x + 27°+ 78°= 180°

3x + 105 = 180 -105 -105

3x = 75°x = 25°

Classifying Triangles

by sides and anglesBeat the

Computer Drill

Review!

Directions:

Classify each triangle by both its SIDES and its ANGLES. You will have 10 seconds

before the computer shows you the answer.

When the slide appears, as a group choose BOTH NAMES for the type of triangle and hold up your answer.

REMEMBER: YOU HAVE TO BEAT THE CLOCK! You only have 10 seconds!

Classify by sides:

Classify by angles:

Trial Run

Classify by sides:

Classify by angles:

alsoIsosceles Triangle

alsoEquilangul

ar Triangle

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

Classify by sides:

Classify by angles:

alsoIsosceles Triangle

alsoEquilangul

ar Triangle

Are you a triangle expert?

Review• In order to form a triangle, the sum

of the angles has to equal 180°.• In order to form a triangle, the sum

of the two smallest side lengths has to be GREATER than the third side.

• In a triangle, the largest angle is opposite the longest side. The smallest angle is opposite the shortest side.

• Skills Check will be on Thursday!!!

Practice