Bellwork Classify each angle as acute, obtuse, or right. 90° 72° 116°

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Presentation transcript:

Bellwork Classify each angle as acute, obtuse, or right. 90° 72° 116° How do you know that ? 1 2

Apply Triangle Sum Properites Lesson 4.1 Apply Triangle Sum Properites

Objective Students classify triangles and find measures of their angles.

Standard 12.0 – Students find and use measures of sides and of interior and exterior angles of triangles and polygons to classify figures and solve problems 13.0 – Students prove relationships between angles in polygons by using properties of complementary, supplementary, vertical, and exterior angles.

Academic Language Triangles Interior angles Exterior angles Scalene, isosceles, equilateral, acute, right, obtuse, equiangular Interior angles Exterior angles Corollary to a theorem

Think/Pair/Share Right, obtuse, acute, equilateral, isosceles, and equiangular

Triangle Polygon with 3 sides A B C

The Real World!

Practice

Interior vs. Exterior……….Angles

Prove

Example

Homework p.221 #1 – 7, 10, 15, 19, 21 – 26, 29