warm up 1.Name 2 pair of alternate interior angles <5 & <3 and <4 & <1 2.What is the sum of m<1 + m<2 + m<3? 180° 3.If m<4 = 65° and m<5 = 50°, what is m<2? 65° (Hint: make the parallel lines and transversal longer so that they jump out at you.) Find all the angle measures 50° 40° 90° 40° 90° 130° 50°

Quiz #2 1.Name 2 pair of alternate interior angles <5 & <3 and <4 & <1 2.What is the sum of m<1 + m<2 + m<3? 180° 3.If m<4 = 45° and m<5 = 50°, what is m<2? 85° Find all the angle measures 45° 37° 98° 37° 98° 135° 45°

BC = 8.5 AC = 8 x = 10 x = 6 x = 8 BC = 25 x = 13

Flashcards Pick a partner Get a set of flashcards Work on identifying angles You will have 10 minutes Go

Triangle Sum Theorem & Exterior Angle Theorem

Triangle Sum Theorem The sum of the angle measures in a triangle equal 180° m<1 + m<2 + m<3 = 180°

Exterior Angle Theorem (your new best friend) The measure of an exterior angle in a triangle is the sum of the measures of the 2 remote interior angles exterior angle remote interior angles m<4 = m<1 + m<2

an example with numbers x 82° 30° y find x & y x = 68° y = 112° 40x 10x30 find all the angle measures 120°, 30°, 30°

Assignment ♥ Triangle Puzzle ♥ Triangle Sum and Exterior Angle Theorems Worksheet