Triangles Find the value of x in the triangle. x + 78° + 56° = 180°

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Presentation transcript:

Triangles Find the value of x in the triangle. x + 78° + 56° = 180° COURSE 2 LESSON 7-4 Triangles Find the value of x in the triangle. x + 78° + 56° = 180° x + 134° = 180° x + 134° – 134° = 180° – 134° x = 46° 7-4

COURSE 2 LESSON 7-4 Triangles Classify each triangle by its sides and by its angle measures. Then find the measure of the missing angle. 1. 2. 18 in 6in 19° 11 in isosceles; acute; 30° This figure is not a triangle Because 6 + 11 = 17 and 17 < 18. The figure is not closed, therefore is not a Polygon (aka. Triangle) 7-4