Triangles 7.3.

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Presentation transcript:

Triangles 7.3

Classification by sides Equilateral has all sides congruent Isosceles has 2 congruent sides Scalene has no congruent sides

Classification by Angles Acute has 3 angles less than 90° Right triangle has 1 angle = 90 ° Obtuse has 1 angle greater than 90 ° Equiangular: has 3 congruent angles (is also acute)

Right, Scalene Triangle

Right, Isosceles Triangle

Triangle Sum Theorem The sum of the measures of the interior angles of a triangle is 180°. B mA + mB +mC = 180° A C

Find m<E in triangle DEF if m<D= 62 degrees and m<F= 39 degrees.

Page 286 (6-13) all Page 288 (1-6) all Homework Page 286 (6-13) all Page 288 (1-6) all