Triangles.

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Presentation transcript:

Triangles

Can be classified by the number of congruent sides Triangles Can be classified by the number of congruent sides

Scalene Triangle Has no congruent sides

Has at least two congruent sides Isosceles Triangle Has at least two congruent sides

Has three congruent sides Equilateral Triangle Has three congruent sides

Can be classified by the angle measures. Triangles Can be classified by the angle measures.

Right Triangle Has one right angle

Acute Triangle Has three acute angles

Triangle with one obtuse angle Obtuse Triangle Triangle with one obtuse angle

The sum of the angles of a triangle is 180 degrees. Triangles The sum of the angles of a triangle is 180 degrees.

To find a missing angle, add up the 2 given angles. Triangles To find a missing angle, add up the 2 given angles.

Subtract the sum from 180 and you have the missing angle. Triangles Subtract the sum from 180 and you have the missing angle.

Classify by the sides and angles. Classify the Triangle Classify by the sides and angles.

Classify the Triangle According to Sides and Angles

Classify by the sides and angles. Classify the Triangle Classify by the sides and angles.

Classify by the sides and angles. Classify the Triangle Classify by the sides and angles.

Classify by the sides and angles. Classify the Triangle Classify by the sides and angles.

Classify by the sides and angles. Classify the Triangle Classify by the sides and angles.

Classify by the sides and angles. Classify the Triangle Classify by the sides and angles.

Classify by the sides and angles. Classify the Triangle Classify by the sides and angles. 1 3 2

Classify by the sides and angles. Classify the Triangle Classify by the sides and angles.

Classify by the sides and angles. Classify the Triangle Classify by the sides and angles.

Find the measure of the missing angle x+ 66 + 55 = 180 x + 121 = 180 x = 59 x

Find the measure of the missing angle x 90 90 + 45 = 135 180 – 135 = 45 x

Find the measure of the missing angle 30+ 90 = 120 180 – 120 = 60 90 x x

Find the measure of the missing angle 2x+2x+2x = 180 6x = 180 X = 30 Each angle measures 60˚ 2x 6 6 2x 2x

Find the measure of the missing angle x+2x+3x = 180 6x = 180 x = 30˚ 2x= 60˚ 3x= 90˚ 2x 3x x

Find the measure of the missing angle x+x+80 = 180 2x + 80 = 180 - 80 -80 2x = 100 2 2 x = 50˚ 80