
Geometry Section 3.3 Pt 1
Presentation
•
Mathematics
•
9th - 12th Grade
•
Medium
Standards-aligned
Shane Devlin
Used 16+ times
FREE Resource
13 Slides • 9 Questions
1
Parallel lines and the triangle angle sum theorem Part 1
2
3
Multiple Select
Use the angles to choose the correct names for the triangle.
isosceles
equiangular
right
acute
obtuse
4
Multiple Select
Use the angles to choose the correct name for the triangle.
isosceles
equiangular
right
acute
obtuse
5
Multiple Select
Use the angles to choose the correct names for the triangle.
isosceles
equiangular
right
acute
obtuse
6
A triangle with three equal angles.
Equiangular Triangle
An triangle with THREE acute angles.
Acute Triangle
7
An triangle with ONE obtuse angles.
Obtuse Triangle
A triangle with ONE right angle
Right Triangle
8
Equiangular and Acute.
An acute triangle doesn't have to be equiangular.
Acute
Can a right triangle also be obtuse? acute?
Right Triangle
9
Multiple Select
Use the sides and angles to choose the correct names for the triangle.
isosceles
equiangular
right
acute
scalene
10
Multiple Select
Use the sides and angles to choose the correct names for the triangle.
isosceles
equilateral
right
acute
scalene
11
12
Equilateral
Can an isosceles triangle be acute? right? obtuse
Isosceles
Can a scalene triangle also be obtuse or acute?
Scalene Triangle
will always be equilangular and acute and isosceles.
13
Given the parallel lines:
What is the relationship of angle 3 and angle 4?
What is the relationship of angle 5 and angle 2?
Use substitution.
In your group complete the backside of your notes together. You have 3 minutes.
14
15
16
Fill in the Blanks
Find the measure of the missing angle.
Type answer...
17
Open Ended
Talk with your neighbor.
Can a triangle have three equal sides and if so, what would the angles measure?
18
Open Ended
Talk with your neighbor.
Can a triangle have two right angles?
Why or why not?
19
Open Ended
Talk with your neighbor.
If a triangle has a right angle, what is the sum of the remaining acute angles?
20
21
#7, 8, 12, and 14 - 23
We will complete the rest tomorrow.
22
Parallel lines and the triangle angle sum theorem Part 1
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