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## PowerPoint Slideshow about ' 4.1 Triangles & Angles' - pello

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### Assignment 4.1 has

A Triangle

- Is a figure formed by three segments
- Joining three noncollinear points….it has
- Sides…..
- And Angles.

Triangles can be classified by sides..

- Scalene (no sides equal)
- Isosceles (as least 2 sides equal)
- Equilateral (3 congruent sides)

A Triangle can be classified by ANGLES…

- Acute (3 acute angles)
- Right (1 right angle)
- Obtuse (1 obtuse angle)
- Equiangular (3 congruent angles)

Triangle Vocabulary

- Vertex A
- Vertex B
- Vertex C

Triangle Vocabulary

- Side opposite angle A
- Side oppositeangle B
- Side opposite angle C

Right Triangles

- Hypotenuse
- Leg
- Leg

Isosceles Triangle

- Base
- Leg
- Leg

When the sides of a triangle are extended….the triangle has

- Interior Angles
- Exterior Angles

Classify the triangle by it’s hasSIDES and Angles.

Classify the triangle by it’s hasSIDES and Angles.

Classify the triangle by it’s hasSIDES and Angles.

Classify the triangle by it’s hasSIDES and Angles.

Classify the triangle by it’s hasSIDES and Angles.

Classify the triangle by it’s hasSIDES and Angles.

Complete each sentence with the word hasalways, sometimes or never.

Theorem 4.1-Triangle Sum Theorem has

- The sum of the interior angles of a triangle is 180 degrees.

Theorem 4.2-Exterior Angle Theorem has

- The measure of an exterior angle of a triangle is equal to the sum of the two nonadjacent interior angles.

A hascorollary to a theorem

- Is a statement that can be proved easily using a theorem
- Think of it as a mini-theorem.

Corollary to the triangle sum theorem has

- The acute angles of a right triangle are complementary.

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