Finding Missing Angles in Triangles

This video tutorial teaches how to find missing angles in triangles. It begins by identifying given angles, including an acute angle of 38° and a right angle of 90°. The tutorial explains that the sum of angles in a triangle is always 180°. It demonstrates how to calculate the missing angle by subtracting the sum of known angles from 180°, resulting in a missing angle of 52°, which is also acute. The video concludes with a summary and encourages students to practice more.

What type of angle is less than 90 degrees?

• Obtuse

• Right

• Straight

• Acute

Tags

CCSS.4.G.A.1

What does a square symbol typically indicate about an angle?

• It is less than 90 degrees

• It is more than 90 degrees

• It is exactly 90 degrees

• It is exactly 180 degrees

Tags

CCSS.4.G.A.1

What is the sum of all angles in any triangle?

• 90 degrees

• 180 degrees

• 270 degrees

• 360 degrees

Tags

CCSS.8.G.A.5

What is the first step in finding a missing angle in a triangle?

• Multiply all angles by two

• Identify the type of each angle

• Add all known angles

• Subtract the largest angle from 180

Tags

CCSS.8.G.A.5

What is the sum of 38 degrees and 90 degrees?

• 148 degrees

• 118 degrees

• 128 degrees

• 138 degrees

Tags

CCSS.4.MD.C.7

If a triangle has angles of 38 and 90 degrees, what is the third angle?

• 42 degrees

• 52 degrees

• 62 degrees

• 72 degrees

Tags

CCSS.8.G.A.5

What operation is used to find the missing angle in a triangle?

• Addition

• Subtraction

• Multiplication

• Division

Tags

CCSS.8.G.A.5

Which type of triangle has one right angle?

• Equilateral

• Isosceles

• Scalene

• Right

Tags

CCSS.4.G.A.2

How can you describe an angle of 52 degrees?

• Right

• Obtuse

• Reflex

• Acute

Tags

CCSS.4.G.A.1

What should you do if you are confused about finding missing angles?

• Ignore the confusion

• Skip the question

• Guess the answer

• Ask questions and review the material

Tags

CCSS.8.G.A.5