Triangles Teacher Twins©2014.

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Presentation transcript:

Triangles Teacher Twins©2014

Find the angle measures. Warm Up Find the angle measures. 115⁰ 65⁰ 65⁰ 115⁰ 115⁰ 65⁰ 65⁰ 115⁰

Triangles

Triangle Review ________triangles have three acute angles. ________triangles have one obtuse angle. ________triangles have one right angle. Acute Obtuse Right

Triangle Review __________ triangles have no congruent sides. Scalene __________ triangles have at least two congruent sides. Base angles are congruent. __________ triangles have three congruent sides. Scalene Isosceles Equilateral

Triangles and Angles 65⁰ + 55⁰ + 60⁰ = 180⁰ 65⁰ 55⁰ 60⁰

Exterior Angle of a Triangle 125⁰ 55⁰ Exterior angles Exterior angles 120⁰ 115⁰ 65⁰ 60⁰ Interior angles

Notice that the interior angle + exterior angle = 180⁰

Practice Find x in the right triangle. 39⁰ 51⁰ 66⁰ 2. Find x in the isosceles triangle. 57⁰ 57⁰ x x

3. Find the exterior angle. 132⁰ ? 48⁰

Closure Find x. 3x + 9 = 180 - 9 = - 9 3x = 171 3 3 x x = 57 x + 5 - 9 = - 9 3x = 171 3 3 x x = 57 x + 5 x + 4