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# Maths year 11 Watch

1. (Original post by RDKGames)
The blue angles are the interior angles of the two pentagons. You can find the red angles because it's a parallelogram where opposite angles are equal, and all of these add up to 360. Black angle + red angle should make up the interior angle of the regular pentagon, thus allowing you to find angle AEH.

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2. Why did you mark blue angles 180? Wouldn't make sense for two angles to add up to 360 with a quadtrilateral. Blue angles are the interior angles of the pentagon's if you can see it.
3. (Original post by RDKGames)
Why did you mark blue angles 180? Wouldn't make sense for two angles to add up to 360 with a quadtrilateral. Blue angles are the interior angles of the pentagon's if you can see it.
Is it 90?

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4. (Original post by z_o_e)
Is it 90?

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No...

5. Those two angles can't be 180 - 180 degrees is a straight line and also all four angles within the quadrilateral must add up to 360 degrees therefore it's impossible to have two angles at 180 degrees.
6. (Original post by RDKGames)
No...

Omg yes I got 108

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8. Correct, now you can find the black angle which is the one you need.
9. (Original post by RDKGames)
Correct, now you can find the black angle which is the one you need.
I got 108

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10. (Original post by z_o_e)
I got 108

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Yeah that's the interior angle of the pentagon, the red and the black angles make up one interior angle and you know the red angle, so you can take one away from the other and get your black angle.
11. (Original post by RDKGames)
Yeah that's the interior angle of the pentagon, the red and the black angles make up one interior angle and you know the red angle, so you can take one away from the other and get your black angle.
36

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12. Yep.
13. (Original post by RDKGames)
Yep.
Thank youuu so much

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14. (Original post by RDKGames)
Yep.
Is this 28*14

Find the area of the semi circles and subtract them from the original answer?

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15. (Original post by RDKGames)
Yep.
Is this 28*14

Find the area of the semi circles and subtract them from the original answer?
.

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16. (Original post by z_o_e)
Is this 28*14

Find the area of the semi circles and subtract them from the original answer?
.

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That's the correct method but trapezium's area is not quite right. Recall your trapezium area to be
17. (Original post by RDKGames)
That's the correct method but trapezium's area is not quite right. Recall your trapezium area to be
OH YESS )
I GOT THE HANG OF THIS YAAY

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18. (Original post by z_o_e)
OH YESS )
I GOT THE HANG OF THIS YAAY

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Also I'd like to just say that if you're a visual learner, and colours help you identify different important things in a question such as that double pentagon one there, then I'd suggest you use them in the future. I believe you can also use them in the exam but ask your teacher just to be sure.
19. (Original post by RDKGames)
Also I'd like to just say that if you're a visual learner, and colours help you identify different important things in a question such as that double pentagon one there, then I'd suggest you use them in the future. I believe you can also use them in the exam but ask your teacher just to be sure.
Thank youu)

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20. (Original post by z_o_e)
Thank youu)

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Correct.

Updated: December 10, 2016
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