11/18/09 Do Now Have your homework out on your desk. Find all of the angle measures below. <1 100° 80°(x+5)° 70° (x-5)° <4.

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Presentation transcript:

11/18/09 Do Now Have your homework out on your desk. Find all of the angle measures below. <1 100° 80°(x+5)° 70° (x-5)° <4

11/18/09Do Now Find all of the angle measures below. <1 100° 80°(x+5)° 70° (x-5)° <4 <1 + 70° = 100° <1 = 30°

11/18/09Do Now Find all of the angle measures below. <1 100° 80°(x+5)° 70° (x-5)° <4 (x-5)° + (x+5)° = 80° x + x = 80 2x = 80 x = 40

11/18/09Do Now Find all of the angle measures below. <1 100° 80°(45)° 70° (40-5)° = 35° <4 100° + 45° + <4 = 180° 145° + <4 = 180° <4 = 35°

Homework Answers Side B #13)<1 = 36 <2 = 122 <3 = 122 <4 = 38 #14)<1 = 50 <2 = 90 <3 = 60 <4 = 60 <5 = 60 <6 = 60 <7 = 110 #15)<A = 60 <B = 30 <C = 90 #16)<A = 83 <B = 38 <C = 59 #17)<A = 40 <B = 50 <C = 90

Homework Answers Side C #8)<1 = 75 <2 = 55 <3 = 55 <4 = 40 <5 = 140 <6 = 40 <7 = 75 <8 = 65 <9 = 115 #9)<1 = 30 <2 = 60 <3 = 50 <4 = 35 <5 = 90 <6 = 55 <7 = 55 <8 = 125 <9 = 35 #10)<A = 30 <B = 60 <C = 90 #11)<A = 64 <B = 67 <C = 49 #12)<A = 100 <B = 50 <C = 30 #13) 131 #14) 100 #15) 125

4-7: Isosceles Triangles Objective: Use properties of Isosceles Triangles

Angles of an Isosceles Triangle

Base Angles Theorem - The base angles of an isosceles triangle are congruent.

Generalization: Congruent angles within a triangles are opposite congruent sides of a triangle. The converse is also true.

Ex. 1: Solve for x and y.

Ex. 2: Solve for x.

Ex. 3: Solve for x and y.

Homework WS 1 – 6 (Both Sides)