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# SAT questions - PowerPoint PPT Presentation

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

### 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.
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:
• 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
• 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
• Side Opposite <EDF : FE
• Angle Opposite DE : <F
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

A.

List sides -

List angles -

B.

C.

Side and angles opposite each other –

<A

<B

<C

### 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.