Classifying Angles
Angles that are less than 90 degrees
Acute Angles
Triangles that have all sides equal
What is equilateral triangles
The little box in the corner of a triangle or any figure represents what?
What is a right angle?
62°
Acute Angle
Can a triangle have two obtuse angles?
Why or Why not?
No, the sides would never touch.
Angles that are equal to 180 degrees
What are straight angles?
Triangles that have no equal sides
What is scalene triangles
What is the measure of the interior angles of an equilateral triangle?
60 degrees
132°
Obtuse
How many triangles? And why?
One, none, or many
angle A = 45o
angle B = 50o
Angle C = 85o
Many triangles
Angles that are equal to 90 degrees
What is a right angle?
Triangles that have two equal sides
What is isosceles triangles
Two interior angle measures of a triangle are 74 degrees and 53 degrees. What is the measure of the third interior angle?
53 degrees
90°
Right Angle
Do the following angles make a triangle?
90°, 40°, and 35°? Explain why or why not
No, 90+40+35=165°, and you need 180° for the interior angles of a triangle.
Angles that are greater than 90 degrees but less than 180 degrees
What are obtuse angles?
Triangles that have three angles less than 90 degrees
What is acute triangles
Can a triangle have these interior angle measures? Why or why not? 36.9 degrees, 110.4 degrees, and 33.7 degrees
No, they do not have a sum of 180 degrees.
What are the limits for the third side AC of a triangle if AB = 6 cm and BC = 12?
AC must be more than 6 cm but less than 18 cm.
How many triangles?
one, none, or many?
AB = 7 cm
AC = 8 cm
angle A = 120o
One triangle;
Side-Included Angle-Side
The number of degrees in a triangle
What is 180 degrees
Triangles that have one angle greater than 90 degrees
What is obtuse triangles
Find the measure of angle A in triangle ABC, if B = 60o and angle C = 58o.
62o
180°
Straight Angle
Do these measurements make a triangle? Why or why not?
3cm, 4cm, 8 cm
No;3 + 4 = 7 and 7 is smaller than 8