GCSE Secondary Maths Age 13-17 - Algebra: Angles - Explained

The video tutorial explains how to find the value of X in a diagram with marked angles. It begins by introducing the diagram and the concept of angles around a point summing to 360 degrees. The instructor sets up an equation involving 2X, 3X, and a right angle of 90 degrees, which equals 360 degrees. The tutorial then demonstrates solving the equation by isolating X, resulting in X being 54 degrees. The video concludes by emphasizing the importance of verifying the solution and understanding the marks awarded for each step.

What is the sum of all angles around a point?

• 360 degrees

• 90 degrees

• 270 degrees

• 180 degrees

Which equation represents the sum of the angles 2X, 3X, and 90 degrees?

• 2X + 3X + 90 = 360

• 2X + 3X + 90 = 450

• 2X + 3X + 90 = 180

• 2X + 3X + 90 = 270

What is the simplified form of the equation 2X + 3X + 90 = 360?

• 5X + 90 = 360

• 5X + 90 = 270

• 5X + 90 = 180

• 5X + 90 = 450

How do you isolate the X term in the equation 5X + 90 = 360?

• Divide both sides by 5

• Add 90 to both sides

• Multiply both sides by 5

• Subtract 90 from both sides

What is the value of X when 5X = 270?

• 45 degrees

• 54 degrees

• 60 degrees

• 50 degrees