The video tutorial explains how to find the size of an angle marked X in a diagram featuring a regular octagon and hexagon. It covers calculating the interior angles of these shapes and using the fact that angles around a point sum to 360 degrees to solve for X. The tutorial emphasizes the importance of understanding interior angles of regular shapes and provides a step-by-step solution, including a marking scheme for the problem.

What is the key concept to understand when solving for the angle marked X in the given problem?

• The Pythagorean theorem

• The properties of regular polygons

• The use of a calculator

• The concept of symmetry

How many degrees do the interior angles of a regular hexagon add up to?

• 360 degrees

• 540 degrees

• 720 degrees

• 1080 degrees

What is the measure of one interior angle in a regular hexagon?

• 90 degrees

• 135 degrees

• 120 degrees

• 150 degrees

What is the measure of one interior angle in a regular octagon?

• 135 degrees

• 120 degrees

• 108 degrees

• 150 degrees

What is the final value of the angle marked X?

• 120 degrees

• 105 degrees

• 90 degrees

• 135 degrees