Classifying Angles
Angles that are less than 90 degrees
Acute
Triangles that have all sides equal
equilateral triangles
The little box in the corner of a triangle or any figure represents what?
A right angle
This tool is commonly used to measure the size of an angle.
What is a protractor?
Angles that are equal to 180 degrees
Straight angles
Triangles that have no equal sides
scalene triangles
What is the measure of each interior angle of an equilateral triangle?
60 degrees
In the angle notation ∠LMN, this letter represents the vertex of the angle.
What is the letter "M"?
Angles that are equal to 90 degrees
Right angles
A triangle that has on 90 degree angle
right triangle
3
In a triangle, if one angle measures 90 degrees, and another angle measures 45 degrees, the third angle must measure this number of degrees.
What is 45 degrees?
Angles that are greater than 90 degrees but less than 180 degrees
Obtuse angles
Triangles that have three angles less than 90 degrees
acute triangles
Can a triangle have these angle measures?
30, 60, 90.
Yes they add up to 180.
A protractor typically measures angles from 0 to this number of degrees.
What is 180 degrees?
The number of degrees total in a triangle
180 degrees
Triangles that have two equal sides
Isosceles
What are the 3 types of triangles by sides.
Scalene, Equilateral, Isosceles
The subject that focuses on measuring angles and triangles is called this.
What is geometry?
What are the 3 types of angles?
Acute, Obtuse, and Right.
Triangles that have no equal sides
Scalene
A triangle has an angle that measures 37 and 56 degrees. What is the measurement of the last angle?
87
There are three main types of triangles, classified by their sides and angles. What are:
Equilateral Triangle
Isosceles Triangle
Scalene Triangle
Acute Triangle
Right Triangle
Obtuse Triangle