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Published byGalilea Hasher Modified over 2 years ago

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Triangles Report by Jennifer Johnson

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What is a Triangle? A polygon Three sides Three angles

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Types of Triangles By Sides Scalene Isosceles Equilateral By Angles Acute Obtuse Right

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Scalene A triangle with no sides congruent.

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Isosceles A triangle with at least 2 congruent sides

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Equilateral A triangle with all sides congruent

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Acute A triangle with all acute angles

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Obtuse A triangle with one obtuse angle

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Right A triangle with one right angle

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Special Theorems The sum of the angles of a triangle equals 180 degrees. If a triangle is an isosceles triangle, then the angles opposites the congruent sides are congruent. If a triangle is an obtuse triangle, then the side opposite the obtuse angle is the longest side of the triangle.

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More Theorems If a triangle is an equilateral triangle, the all angles of the triangle are congruent and equal 60 degrees. The two acute angles of a right triangle are complementary.

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Prove: The two acute angles of a right triangle are complementary 1. ABC is a triangle,

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