Finding Missing Angles in Triangles

This video tutorial covers the basics of angles, including complementary and supplementary angles. It explains the triangle angle sum theorem, which states that the sum of all interior angles in a triangle is always 180 degrees. The video provides examples and exercises to solve for unknown angles in triangles, reinforcing the concepts discussed.

What type of angles sum up to 90 degrees?

• Supplementary

• Obtuse

• Acute

• Complementary

Tags

CCSS.7.G.B.5

What type of angle pair is formed by angles that sum to 90 degrees?

• Adjacent

• Supplementary

• Complementary

• Vertical

Tags

CCSS.7.G.B.5

If one angle is 85 degrees, what must the other angle be to form a supplementary pair?

• 95 degrees

• 85 degrees

• 105 degrees

• 100 degrees

Tags

CCSS.7.G.B.5

What are angles called that add up to 180 degrees?

• Adjacent

• Supplementary

• Vertical

• Complementary

Tags

CCSS.7.G.B.5

What is the sum of the interior angles of any triangle?

• 270 degrees

• 360 degrees

• 180 degrees

• 90 degrees

Tags

CCSS.8.G.A.5

What is the sum of angles in a triangle?

• 270 degrees

• 180 degrees

• 360 degrees

• 90 degrees

Tags

CCSS.8.G.A.5

If one angle in a triangle is 70 degrees and another is 50 degrees, what is the third angle?

• 60 degrees

• 55 degrees

• 70 degrees

• 75 degrees

Tags

CCSS.8.G.A.5

In a triangle, if angle A is 55 degrees and angle B is 75 degrees, what is angle C?

• 55 degrees

• 40 degrees

• 45 degrees

• 50 degrees

Tags

CCSS.8.G.A.5

What is the value of x if angle D is 90 degrees, angle E is 7x, and angle F is 3x in a triangle?

• 11

• 10

• 9

• 12

Tags

CCSS.8.G.A.5

If angle E is 7x and angle F is 3x, what is the value of x when angle D is 90 degrees?

• 7

• 8

• 10

• 9

Tags

CCSS.7.G.B.5