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SAT questions. Answers D,C,C,D. Section 4.1 – Classifying Triangles. November 11, 2009. Triangle defined. 3 sided polygon POLYGON defined: a closed figure in a plane that is made up of segments, called sides that intersect only at their endpoints, called vertices.

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sat questions
SAT questions
  • Answers D,C,C,D
triangle defined
Triangle defined
  • 3 sided polygon
  • POLYGON defined: a closed figure in a plane that is made up of segments, called sides that intersect only at their endpoints, called vertices.
triangles are named by sides and angles
Triangles are named by: Sides and Angles.
  • SIDES
    • Scalene – no sides are congruent
    • Isosceles – 2 sides are congruent
    • Equilateral – 3 sides are congruent
triangles are names by sides and angles
Triangles are names by Sides and Angles:
  • ANGLES
    • Acute – all 3 angles are acute
    • Obtuse – one angle is obtuse
    • Right – one angle is 90º
    • Equiangular – all angles are equal (60º)
parts of triangles
Parts of Triangles
  • Isosceles Triangles:
    • Legs – 2 congruent sides
    • Base – side opposite the vertex <
    • Vertex < - angle formed by the legs
    • Base <s – 2 angles opposite the legs

VERTEX ANGLE

LEG

LEG

BASE ANGLE

BASE ANGLE

BASE

parts of an isosceles triangle
Parts of an Isosceles Triangle
  • Side Opposite <EDF : FE
  • Angle Opposite DE : <F
parts of a right triangle
Parts of a Right Triangle
  • Hypotenuse: side opposite the right angle
  • Legs: two sides adjacent to the right angle

ACUTE ANGLES

LEG

HYPOTENUSE

RIGHT ANGLE

LEG

labeling a triangle
Labeling a Triangle

A.

List sides -

List angles -

B.

C.

Side and angles opposite each other –

<A

<B

<C

homework

HOMEWORK:

PRACTICE WORKBOOK 4 – 1

#1-10

* You may use a classroom protractor for #8 & 9 if you don’t have one. Return it at the end of class.