Interior Angles of Triangles

Interior Angles of Triangles

Interior (inside) angles of triangles always add up to equal 180^o

• If we tear the corners off of a triangle

• Then place them together

• They will create a STRAIGHT Line

• which is 180^o

Since we know 2 angles:

180-37-63 = 80

<U = 80^o

Since we know 2 angles, we know there is a right angle (90) and 46:

180-90-46= 44^o <B = 44^o

Since we know 2 angles:

180-118-33 = 29^o <Y = 29^o

Multiple Choice

What is the measure of <x?

• 180^o

• 65^o

• 110^o

• 135^o

Multiple Choice

What is the measure of <C?

• 77^o

• 50^o

• 130^o

• 103^o

Multiple Choice

What is the measure of <K?

• 180^o

• 62^o

• 90^o

• 60^o

Multiple Choice

What is the measure of <U?

• 110^o

• 70^o

• 180^o

• 35^o

Multiple Choice

• 90^o

• 180^o

• 87^o

• 93^o