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GEOMETRYMILBY HIGH SCHOOL
MR. SAUCEDO
4.1 Applying Triangle Sum Properties
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OBJECTIVE
We will classify triangles and find measures of their angles.
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REVIEW
On your notebook, draw an example of the following. A triangle A Scalene Triangle Isosceles Triangle Equilateral Triangle Acute Triangle Right Triangle Obtuse Triangle Equiangular Triangle
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CLASSIFYING TRIANGLES
We can classify We can also classify
triangles by their … Triangles by their…
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REVIEW:Classifying triangles by their angles
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REVIEWClassifying by Triangle Sides
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CHECKPOINT
CLASSIFY THE FOLLOWING TRIANGLES. (WORD BANK: Scalene, isosceles, equilateral, acute, right, obtuse,
equiangular)
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CHECKPOINT
Label the followingTriangles by theirAngles and sides.
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GUIDED PROBLEM 1
Classify the triangleBy its sides, then Determine if is a Right triangle.
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CHECKPOINT
Classify the triangle by its sides, then determine if is a right triangle.
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TRIANGLE SUM THEOREM
The sum of the measures of the interior angles of a triangle is 180 degrees.
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EXTERIOR ANGLES
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EXTERIOR ANGLE THEOREM
The measure of an exterior angle of a triangle is equal to the sum of the measures of the two non adjacent interior angles.
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CHECKPOINT
Find the measurement of Angle x.
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GUIDED PROBLEM
Find the measure of the exterior angle.
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CHECKPOINT
Find the measurement of the exterior angle CBD.
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CHECKPOINT
Find x.
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INDEPENDENT PRACTICEEnter the responses in your clickers.
1. Problem 52. Problem 12: What kind of triangle is it?3. Problem 12: Is it a right triangle?4. Problem 14: what is x?5. Problem 16: What is x?6. Problem 197. Problem 228. Problem 319. Problem 34: what is x?
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HOMEWORK
SECTION 4.1
Problems: 1, 2, 3, 4, 7, 10, 11, 14, 15, 17, 18, 19, 20, 22.
Pre AP: Add problem 23 & 25.