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Triangle Song - YouTube
Triangles
A triangle is a 3-sided polygon. Every triangle has three sides and three angles. When added together, the three angles equal 180°.
Acute Triangles
An acute has three angles that are less
than 90°. Remember AAAA. ALL ANGLES ARE
ACUTE!
Obtuse Triangles An obtuse triangle is a
triangle in which one of the angles is greater than 90° and the other two angles are acute.
One obtuse angle and
Two acute angles
Right Triangles
A right triangle is triangle with an angle of 90°.
One right angle and two acute angles
Scalene Triangles A triangle with
three unequal sides.
The “mean scalene” doesn’t want to get along. All of the sides are different lengths!
Isosceles Triangles
To remember this triangle…..
“eye” …soceles” It will remind me that I have 2 eyes. The “e-l-e-s” at the end is close to how we spell the word eyes.
An isosceles triangle has 2 sides that are the same (equal in length).
It has at least 2 acute angles.
An isosceles triangle is a triangle with two equal sides.
When two sides are the same we call them CONGRUENT.
Equilateral Triangles
An equilateral triangle is a triangle with all three sides of equal length
All the angles will be the same size (acute).
Equilateral you are so fine, all your sides are the same size!
Triangle Quiz
Please complete the following quiz that covers the information that was just presented to you.
Question 1 If a triangle has
three unequal sides it is a ______ triangle.A) ScaleneB) ObtuseC) Isosceles
Answer:A) Scalene
Question 2 A triangle which has
three equal sides is a ______ triangle.A) AcuteB) EquilateralC)Scalene
Answer:C) Equilateral
Question 3 A triangle with (at
least) two equal sides is a ______ triangle.A) ScaleneB) IsoscelesC) Congruent
Answer:B) Isosceles
Question 4
Two triangles that are equal are called ______ trianglesA) Acute B) Obtuse C) Congruent
Answer:C) Congruent
Question 5 A triangle with all
three sides of equal length is a ______ triangle.A) EquilateralB) RightC) Equiangular
Answer:A) Equilateral
Question 6 A triangle with an
angle of 90° is a ______ triangle.A) AcuteB) RightC) Congruent
Answer:B) Right
Question 7 A triangle in which
all three angles are less than 90° is a ______ triangle.A) RightB) AcuteC) Scalene
Answer:B) Acute
Question 8 A triangle in which
one of the angles is greater than 90° is a ______ triangle.A) ObtuseB) IsoscelesC) Acute
Answer:A) Obtuse
http://www.aaamath.com/geo318-triangle-angles.html
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