Objectives: Classify triangles and find the measures of their angles Use the exterior angles of triangles.

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Presentation transcript:

Objectives: Classify triangles and find the measures of their angles Use the exterior angles of triangles

 The sum of the measures of the angles of a triangle is 180 degrees A BC

Find the m ∠ ° 1 15° 17°

Using Algebra: Find the values of x, y, and z. 65°z°y°x° 21° 39°

Find the measure of each numbered angle: ° ° ° 9

Find the value of the variable: x° (2x)°

 Equiangular: all ∠’s are ≅  Acute: all ∠’s are less than 90°  Right: One right angle  Obtuse: One angle greater than 90° (but less than 180°

 Equilateral: All sides are ≅  Isosceles: At least 2 sides ≅  Scalene: No ≅ sides

Exterior ∠ of a Polygon: Formed by a side and an extension of a side Remote Interior ∠: Non-adjacent, interior ∠’s Triangle Exterior Angle Theorem: m∠ACD = m∠A + m∠ B

Find the indicated measures: ° ° 13° 2

Find the measure of each numbered angle. Justify your answer °213 48° 78° 23 40°