71b complete.notebook
I know how to classify triangles and I know the sum of the interior angles in a triangle
71b complete.notebook
Do Now: Take out marker boards for review
71b complete.notebook
What type of angle(s)...
71b complete.notebook
71b complete.notebook
71b complete.notebook
71b complete.notebook
71b complete.notebook
71b complete.notebook
Create an equation for...
6x + 11
4x + 9
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7x
2x
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7x + 12
8x + 11
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8x + 10
7x + 10
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71b complete.notebook
Activity #1: Try to sort the triangles into 3 groups by looking at their biggest angle.
71b complete.notebook
Classifying Triangles based on their angles
1.Acute triangles­ Have 3 acute angles
2.Obtuse Triangles­ Have 1 obtuse angle
3.Right Triangles­ Have 1 right angle
71b complete.notebook
Activity #2: Measure the angles in all of your triangles. For each triangle add up the 3 angles and write the sum under the triangle.
71b complete.notebook
Big Idea:
The sum of the interior angles in any triangle is 1800
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Activity #3: Measure the 3 sides of your triangles. Sort them into
3 groups based on triangles that have no equal sides, triangles that
have 2 equal sides, and triangles that have 3 equal sides
71b complete.notebook
Classifying Triangles based on their sides
1. Scalene- Have 0 equal sides or equal angles
2. Isosceles- Have 2 equal sides and 2 equal angles
3. Equilateral- Have 3 equal sides and 2 equal angles. All
of the angles measure
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Review: In any type of triangle the angles add up to
Classify by angle
obtuse
classify by side
scalene
right
acute
Isosceles
equilateral
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Marker Boards:
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All the angles in a triangle add to
2x
3x + 20
x+10
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CW: On the marker board draw a triangle and put expressions in
the 3 angles. Solve your problem on a separate sheet of paper.
71b complete.notebook
HW 71: p.472 #1-14
71b complete.notebook