TODAY IN GEOMETRY…

Warm Up: Advanced Angles Practice

Review for CH. 4 QUIZ

CH. 4 QUIZ – TODAY!

WARM UP: Find all missing angles.

37 °143 ° 37 ° 58 °

37 °

Add a right angle!

53 °

48 °

84 °96 °

26 °

26 °

69 °111°

69 °

REVIEW: Classifying Triangles

Ways to classify triangles by SIDES:Scalene – no congruent sidesIsosceles – 2 congruent sidesEquilateral – All congruent sides

Ways to classify triangles by ANGLES:Acute – All angles less than 90 degreesRight – One angle is 90 degreesObtuse – One angle is greater than 90 degreesEquiangular – All angles are congruent

1

32

∠𝟏+∠𝟐+∠𝟑=𝟏𝟖𝟎 °

REVIEW: Finding Interior and Exterior Angles for Triangles

TRIANGLE SUM THEOREM

EXTERIOR ANGLE

THEOREM1

32

∠𝟏+∠𝟐=∠𝟒

4

REVIEW: Find the value of x. Then classify the triangle by its angles.

Use triangle sum theorem:

OBTUSE

31 °

93 °

Use triangle sum theorem:

ACUTE

58 °

59 °

63 °Linear pairs:

RIGHT

120 °30 °

CHAPTER 4 QUIZ You have the rest of class to complete your quiz Are you prepared? Pencil? Calculator? Yellow notes allowed If you finish early:

Finish any missing assignments. Work on something quietly as the rest of

your fellow classmates complete their quizzes.

NO TALKING. STAY IN YOUR SEATS. RETURN ANY BORROWED BOOKS AND

CALCULATORS. Turn in any missing or corrected assignments.

HOMEWORK:

Reminder: All assignments due before Thanksgiving Break

If finished, work on other assignments:

HW #1: 221: 1-26, 32, 35-37HW #2: Pg. 228: 3-10, 15-16, 19-21 Pg. 231: 33-40