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Triangles Report by Jennifer Johnson. What is a Triangle? A polygon Three sides Three angles.

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Presentation on theme: "Triangles Report by Jennifer Johnson. What is a Triangle? A polygon Three sides Three angles."— Presentation transcript:

1 Triangles Report by Jennifer Johnson

2 What is a Triangle? A polygon Three sides Three angles

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

4 Scalene A triangle with no sides congruent.

5 Isosceles A triangle with at least 2 congruent sides

6 Equilateral A triangle with all sides congruent

7 Acute A triangle with all acute angles

8 Obtuse A triangle with one obtuse angle

9 Right A triangle with one right angle

10 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.

11 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.

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


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