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10-4 Triangles pages 428-431 Indicators G3b- Use triangle sum relationships to solve problems. G4- Determine necessary conditions for congruence of triangles.
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A triangle is a figure with three sides and three angles. The sum of the measures of the angles of a triangle is always 180º. 1 + 2 + 3 = 180º 2 31
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Example An airplane has wings that are shaped like triangles. Find the missing measure. 1 + 2 + 3 = 180º 112º + 47º + x = 180º 159º + x = 180º - 159 - 159 x = 21º 112º 47ºxºxº The measure of the wing’s third angle 21º.
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Classify Triangles Using Angles Acute All acute (<90º) angles Right 1 right (90º) angle Obtuse 1 obtuse (>90º) angle
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= = =
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Classify each given triangle by angles and sides acute, equilateral acute, scalene Right, scalene acute, isosceles Obtuse, scalene
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