Finding Missing Angles in Triangles

The video tutorial covers the concept of finding missing angles in triangles. It begins by explaining that the sum of angles in a triangle is always 180 degrees, similar to a straight line. The tutorial then discusses right angles, which measure 90 degrees, and how to identify congruent angles in isosceles triangles. Through various examples, the video demonstrates how to calculate missing angles by using known angles and properties of triangles, including equilateral and isosceles triangles. The tutorial concludes with encouragement to persist in problem-solving.

What is the total measure of angles in a triangle?

• 270 degrees

• 90 degrees

• 180 degrees

• 360 degrees

Tags

CCSS.8.G.A.5

If a straight line measures 180 degrees, what does this imply about the angles in a triangle?

• They add up to 90 degrees

• They add up to 180 degrees

• They add up to 360 degrees

• They add up to 270 degrees

Tags

CCSS.8.G.A.5

What is the measure of a right angle?

• 90 degrees

• 120 degrees

• 60 degrees

• 45 degrees

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CCSS.4.G.A.1

How can you identify a right angle in a triangle?

• By a triangle mark

• By a square box

• By a straight line

• By a small circle

Tags

CCSS.2.G.A.1

What does it mean if two angles in a triangle are marked with the same arc?

• They are congruent

• They are supplementary

• They are right angles

• They are complementary

Tags

CCSS.8.G.A.2

In an isosceles triangle, if one angle is 40 degrees, what is the measure of each of the other two angles?

• 60 degrees

• 50 degrees

• 70 degrees

• 40 degrees

Tags

CCSS.8.G.A.5

If two angles in a triangle are 52 degrees and 62 degrees, what is the measure of the third angle?

• 66 degrees

• 128 degrees

• 72 degrees

• 28 degrees

Tags

CCSS.8.G.A.5

In an equilateral triangle, what is the measure of each angle?

• 45 degrees

• 60 degrees

• 90 degrees

• 120 degrees

Tags

CCSS.8.G.A.5

If an isosceles triangle has one angle of 26 degrees, what is the measure of each of the other two angles?

• 77 degrees

• 77 degrees

• 154 degrees

• 52 degrees

Tags

CCSS.8.G.A.5

What should you do if you get stuck on a math problem?

• Give up

• Skip it

• Persist and use what you know

• Ask someone else to do it

Tags

CCSS.5.MD.A.1