Right angles are exactly ... degrees
90
What is the name of this kind of triangle by it's sides?
Scalene triange
A triangle has angle measurements of 163°, 2°, and 15°. What kind of triangle is it by it's angles?
Obtuse Triangle
The combined angle measure is 115°. What does angle t measure?
25 degrees
The sum of angles in a triangle is...
180 degrees
Straight line angles are exactly ... degrees
180
Name this triangle for its sides AND angles.
Right Scalene Triangle
Describe right-angled triangles
Triangles that have one right angle.
Tell whether the angles are complementary or supplementary. Then find the value of x
Complimentary, x=5
What is the difference between complementary and supplementary angles?
Complementary angles add to 90 degrees.
Supplementary angles add to 180 degrees.
What do angles of a revolution (a circle) add up to?
360 degrees
This angle can be written as... m<______
m< ABC
m<CBA
m<B
Describe obtuse angles
An angle that is larger than 90 degrees
Which type of triangle has one angle greater than 90 degrees and two equal acute angles?
Obtuse Isosceles
Scalene triangles have...
All different sides and angles
What is an acute angle?
An angle that is less than 90 degrees
Find both missing angles. Use logic.

x=x
so
180-110 = 70
70/2 = 35
x=35 degrees
Classify the triangle by it's sides and angles.

Right Scalene Triangle
A point where two or more lines meet, a corner. HINT: You use this to name an angle!
vertex
Triangles that have one pair of equal sides and angles are called...?
Isosceles triangle
What kind of triangle is this? AND How many degrees is x?

Acute Triangle (all angles are less than 90 degrees)
x = 65 degrees
Classify this triangle by it's sides and angles.

Obtuse Isosceles Triangle
Can a right triangle also be an equilateral triangle? Why or why not?
No because equilateral triangles have all the same angles (60 degrees).
A right triangle has a 90 degree angle.
90 + 90 + 90 is greater than 180, and a triangle's angles must add to 180 degrees.
Can a scalene triangle have a right angle? Why or why not?
Yes; scalene triangles have all different side lengths. We can make a triangle with different side lengths that has a right angle.
Example:

The longest side of a triangle will always be opposite what?
The largest angle