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Triangles
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Triangles Three sides Three angles Measures a total of 180°
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Triangles Equilateral Isosceles Scalene
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Triangles Equilateral Three equal sides Three equal angles, always 60°
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Triangles Isosceles Two equal sides Two equal angles
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Triangles Scalene No equal sides No equal angles
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Which is which?
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Practice Work on the following handout
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Triangles Right Obtuse Acute
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Triangles Right Triangle A triangle with a right angle
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Triangles Right Triangle Isosceles Right One right angle
Two other equal angles always of 45° Two equal sides Scalene Right Two other unequal angles No equal sides 60° 30°
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Triangles Acute Triangle A triangle with all angles less than 90°
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Triangles Obtuse Triangle A triangle with one obtuse angle
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Which is which?
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Triangle Properties The sum of the interior angles is always 180 degrees
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Triangle Properties If you need to find the missing angle inside a triangle: Find the sum of the known angles Subtract this sum from 180 70° + 50° 120° 180°-120° 60° a=60°
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Triangle Properties
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Practice Work on the following handout
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Triangle Properties Interior and Exterior Angles are supplementary
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Triangle Properties Interior and Exterior Angles are supplementary
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Triangle Properties Interior and Exterior Angles are supplementary
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Practice Work on the following handout
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Triangle Properties The longest side of a triangle is opposite the largest angle 30° 100° 50°
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Which is the longest?
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Practice Work on the following handout
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