Understanding Angles in Geometry

The video tutorial explains how to find the measure of angle BDC by labeling it as X. It sets up an equation using the internal angles and the external angle, then solves for X by subtracting 60 from both sides, resulting in X equaling 60.

What is the first step in solving for the measure of angle BDC?

• Label the angle as Y

• Ignore the angle

• Assume the angle is 90 degrees

• Label the angle as X

Tags

CCSS.7.G.B.5

What is the sum of the internal angles 60 and X equal to?

• 60 degrees

• 120 degrees

• 180 degrees

• 90 degrees

Tags

CCSS.8.G.A.5

Which of the following is an external angle in the problem?

• 90 degrees

• 120 degrees

• X degrees

• 60 degrees

Tags

CCSS.2.MD.B.5

How do you find the value of X in the equation 60 + X = 120?

• Divide both sides by 60

• Multiply both sides by 60

• Subtract 60 from both sides

• Add 60 to both sides

Tags

CCSS.7.G.B.5

What is the measure of angle BDC after solving the equation?

• 120 degrees

• 90 degrees

• 60 degrees

• 30 degrees

Tags

CCSS.7.G.B.5