Determine the missing variable using the sum of interior angles ex 1

The video tutorial demonstrates how to solve for the variable X in a polygon by using expressions for angles. It explains the sum of angles in a quadrilateral and how to set up and solve an equation to find the value of X. The process involves understanding the sum of interior angles, setting up an equation, and solving it step-by-step to find the missing variable.

What is the sum of the interior angles of a quadrilateral?

• 180 degrees

• 540 degrees

• 720 degrees

• 360 degrees

Which formula is used to calculate the sum of interior angles of a polygon?

• S = n * 180

• S = (n - 2) * 180

• S = (n - 2) * 90

• S = n * 90

What is the first step in solving for a variable in an equation?

• Add all terms

• Subtract all terms

• Set up the equation

• Multiply all terms

After combining like terms, what is the next step to solve 6X + 180 = 360?

• Divide both sides by 6

• Add 180 to both sides

• Subtract 180 from both sides

• Multiply both sides by 6

What is the value of X when solving the equation 6X = 180?

• 15

• 20

• 30

• 25