What is the key concept to understand when solving for the angle marked X in the given problem?
GCSE Secondary Maths Age 13-17 - Geometry & Measures: Interior Angles of Regular Shapes - Explained

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Mathematics
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10th - 12th Grade
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Hard
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The Pythagorean theorem
The properties of regular polygons
The use of a calculator
The concept of symmetry
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many degrees do the interior angles of a regular hexagon add up to?
360 degrees
540 degrees
720 degrees
1080 degrees
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the measure of one interior angle in a regular hexagon?
90 degrees
135 degrees
120 degrees
150 degrees
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the measure of one interior angle in a regular octagon?
135 degrees
120 degrees
108 degrees
150 degrees
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the final value of the angle marked X?
120 degrees
105 degrees
90 degrees
135 degrees
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