
Angles In a Triangle
Presentation
•
Mathematics
•
4th - 6th Grade
•
Easy
Standards-aligned
Aria Pham
Used 150+ times
FREE Resource
6 Slides • 2 Questions
1
Angles In a Triangle - introduction
*remember to read each slide carefull!
2
Basic rules:
angles in a triangle all add up to 180o. It cannot be more or less than 180o.
3
Types of triangles
Isosceles: - 2 sides are equal (in length), 2 angles are equal
Equilateral: - all sides and angles are equal
scalene: no sides are the same length and no angles are equal.
right-angled triangle: one of the angles is 90o
right-angles isosceles triangle: an isosceles triangle with one right angle
4
Open Ended
This triangle has 2 equal angles that are 60o. What type of triangle is this?
5
Explanation
The answer you could write is an equilateral triangle! We know that 2 of the angles in the triangle is both 60o. Since all angles in a triangle add up to 180o, the last angle must also be 60o! (60+60+60 = 180)
6
Obtuse, Acute and Right triangles
obtuse triangle: a triangle that has an angle that is >90o (larger than 90o)
acute triangle: a triangle that has all angles that are <90o (smaller than 90o)
right triangle: a triangle that has an angle that is 90o (equal to 90o)
7
Take a careful look at this image, it will help you with your next question
8
Multiple Choice
what type of triangle was in the image shown on the slide before?
equilateral triangle
acute triangle
right triangle
Angles In a Triangle - introduction
*remember to read each slide carefull!
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