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L.E.Q. How do you find measures of interior and exterior angles of triangles? Draw and cut out a large triangle. Number the angles and tear them off. Place the three angles adjacent to each other to form one angle. What do you see? 65º 25º Focus – Prove the Triangle Sum Theorem The sum of the measures of the angles of a triangle is 180. mA mB mC 180 Find the missing angle. 43 47º Find the values of x, y, and z. G 21 39 F x - 11 x y J z H All 3 angles are congruent. Has one right angle. T B L S S U First tell me this, what is an acute angle? An acute triangle has three acute angles. 50° 46° 72° 50° 58° 84° What’s an obtuse angle? An obtuse triangle has one obtuse angle. X S A 135° W 98° M V A triangle with no congruent sides. X 11” 28” W V 20” Can we use tick/dash marks to denote congruence of sides in triangle XWV? An equilateral triangle has three congruent sides. 3’ 3’ 3’ Has at least two congruent sides. F J M E A O An angle that is formed outside the polygon by extending a side of the polygon past its vertex. The 2 interior angles of a triangle that are nonadjacent to the exterior angle. The measure of each exterior angle of a triangle is equal to the sum of the 2 remote interior angles. Add These! Get This! 120º T 55º J U 120 35 L Pg 134 – 135 #s 1-15, 24-28 all.