10.4 and 10.5
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10.4 Triangles10.5 Quadrilaterals
Identify and Classify Triangles and Quadrilaterals
P 428 Hands-on Mini LabFirst—Watch the demonstration
• Use a straightedge to draw a triangle with three acute angles. Label the angles A, B, and C. Cut out the triangle.
• Fold angle B so that its vertex touches the line between angles A and C. The fold should be parallel to the base of the triangle.
• Fold angle A and angle C so the vertices meet.
Questions for mini lab
• What kind of angle is formed where the three vertices meet?
• Repeat the activity with another triangle.
• Make a conjecture about the sum of the measures of three angles of any triangle.
A triangle has ___ angles.The angles add to give you ____.
1
2
3
Find x
32°
x
64°
Bermuda Triangle
P 428 example 1
p 429 example 2
An airplane has winds that are shaped like triangles. Find the
missing measure.• (In class example 1)
In class example 2
Properties of triangles video
In groups talk about the four types of triangles mentioned in
the video.
Classify by ANGLES
Acute Triangle Right Triangle Obtuse Triangle
____ angles are _______ 90°
____angles are _______ 90°
____angles are _______ 90°
Classify by Sides
Scalene Triangle Isosceles Triangle Equilateral Triangle
____ congruentsides
____ congruentsides
____ congruentsides
Classify the triangle by its angles and by its sides
Classify the triangle by its angles and by its sides
Classify the triangle by its angles and by its sides
Classify the triangle by its angles and by its sides
P 429 example 3 and 4
Workbook 10-4
Turn and Talk
• What does quad mean?
• What is a quadrilateral?
10-5 Quadrilaterals
Quadrilateral
Parallelograms Trapezoid
Rectangle Rhombus
Square
Classify the quadrilateral using the name that best describes it.
Classify the quadrilateral using the name that best describes it.
Quadrilateral Video
Classify the quadrilateral using the name that best describes it.
Classify the quadrilateral using the name that best describes it.
Angles
• Divide the parallelogram into 2 triangles.
• What is the sum of angles in both triangles?
• Then what is the sum of angles in the parallelogram?
P 435: example 3
In class example 3
More examples from workbook
Quadrant Card—Fill in the top 2 quadrants. Then exchange with a
partner and fill in the bottom 2.
Without giving it’s name, describe one type of
triangle.
Without giving it’s name, describe one type of
quadrilateral.
Draw a picture and name the triangle described above.
Draw a picture and name the quadrilateral
described above.
Homework
• p 430: 2, 5-23 and p 435: 4-6, 10-23
• DUE FRIDAY!!!