3-3 PARALLEL LINES AND THE TRIANGLE

SUM THEOREM

Students will explicitly define, use, and calculate

exterior and interior angles of triangles.

FINDING ANGLE MEASURES IN TRIANGLES

What kind of triangle is this?

ACUTE

What happens when you move all three angles together?

180o

1

2 3

2 3

FINDING ANGLE MEASURES IN TRIANGLES

What kind of triangle is this?

RIGHT

What happens when you move all three angles together?

180o

1

23

23

FINDING ANGLE MEASURES IN TRIANGLES

What kind of triangle is this?

Obtuse

What happens when you move all three angles together?

180o

1

2 3

2 3

3-5 QUIZ Use the following questions to assess yourself and see how well you understand today’s lesson.

Be sure to ask if you miss one and don’t know why!

Remember to record your score on your portfolio sheet.

1. FIND THE VALUE OF K. THE DIAGRAM IS NOT

TO SCALE.

62°

45° k °

A. 17B. 73C. 118D. 107

2. FIND THE VALUE OF X. THE DIAGRAM IS NOT TO SCALE.

A. 33B. 162C. 147D. 75

3. A TRIANGULAR PLAYGROUND HAS ANGLES WITH MEASURES IN THE RATIO 8 : 6 : 4. WHAT IS THE MEASURE OF THE SMALLEST ANGLE?

A. 30B. 40C. 5D. 20

4. THE FOLDING CHAIR HAS DIFFERENT SETTINGS THAT CHANGE THE ANGLES FORMED BY ITS PARTS. SUPPOSE M2 IS 26 AND M3 IS 70. FIND M1 . THE DIAGRAM IS NOT TO SCALE.

1

2

3

A. 96B. 106C. 116D. 86

5. FIND THE VALUE OF THE VARIABLE. THE DIAGRAM IS NOT TO SCALE.

114°

47°x°

A. 66B. 19C. 29D. 43

ASSIGNMENT3-5 p.175-177 #10-34 evenThen rate your assignment 4-3-2-1-0 as to how well you understood the lesson and write why you rated yourself that way.

You will need your compass MONDAY!!