Exploring Additive Angles: Composition and Decomposition

The video tutorial introduces the concept of additive angles, focusing on composing and decomposing angles using addition and subtraction. It explains right and straight angles, provides examples of solving for unknown angles, and highlights common mistakes, such as unnecessary use of protractors.

What is the degree measure of a right angle?

• 360 degrees

• 90 degrees

• 45 degrees

• 180 degrees

Tags

CCSS.4.G.A.1

What is the total degree measure of a straight angle?

• 90 degrees

• 180 degrees

• 270 degrees

• 360 degrees

Tags

CCSS.4.MD.C.5B

CCSS.HSG.CO.A.1

How do you find the measure of angle ABC if you know the measures of angles ABD and DBC?

• Subtract the measures

• Multiply the measures

• Add the measures

• Divide the measures

Tags

CCSS.4.MD.C.7

What is the measure of angle ABC if angle ABD is 47 degrees and angle DBC is 26 degrees?

• 21 degrees

• 26 degrees

• 73 degrees

• 47 degrees

Tags

CCSS.4.MD.C.7

Why is a protractor not necessary for solving problems with labeled parts?

• The angles are always right angles

• The angles are too small

• The protractor is usually broken

• The angles are not drawn to scale

Tags

CCSS.4.MD.C.6

What is the measure of angle DME if angle AMD is 43 degrees and AME is a right angle?

• 137 degrees

• 43 degrees

• 90 degrees

• 47 degrees

Tags

CCSS.7.G.B.5

How do you find the missing part of an angle if you know the whole and one part?

• Add the known parts

• Subtract the known part from the whole

• Multiply the parts

• Divide the whole by the known part

Tags

CCSS.4.MD.C.7

What type of angle is formed by a 180-degree measure?

• Acute angle

• Right angle

• Straight angle

• Obtuse angle

Tags

CCSS.4.G.A.1

If angle Y is obtuse and part of a straight angle, what is the measure of Y if another part is 35 degrees?

• 145 degrees

• 180 degrees

• 35 degrees

• 90 degrees

Tags

CCSS.7.G.B.5

What is the process called when you break an angle into smaller parts?

• Subtracting

• Dividing

• Composing

• Decomposing

Tags

CCSS.4.MD.C.7