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1. The diagram shows a parallelogram.
The sizes of the angles, in degrees, are

2x
3x – 15
2x
2x + 24

Work out the value of x

3x – 15 is top left
2x top right
2x+24 bottom right
2x bottom left

I feel like I should know how to do it but I'm baffled - if someone could talk me through it that'd be great!
2. The opposite angles in a parallelogram are the same. You need an equation.
3. How do I get the equation? What am I not getting?!!

4. (Original post by KittyKat10)
How do I get the equation? What am I not getting?!!

Choose 2 opposite angles and make them equal to each other. Only one pair will do because the other pair is already the same.
5. If you add up all the angles it would be 360 degrees, so if you do that, and rearrange it into an equation, you should get it

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6. (Original post by KittyKat10)
The diagram shows a parallelogram.
The sizes of the angles, in degrees, are

2x
3x – 15
2x
2x + 24

Work out the value of x

3x – 15 is top left
2x top right
2x+24 bottom right
2x bottom left

I feel like I should know how to do it but I'm baffled - if someone could talk me through it that'd be great!
Both the suggestions you've been given will work. If you're feeling really enthusiastic, try both methods and check that you get the same answer
7. 2x + 24 = 3x - 15
24 +15 = 3x - 2x
x = 39.

Check that using x=39 gives you 360 when adding up the four angles.

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Updated: April 10, 2013
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