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Math P2 MJ 2010 doubts

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HUSH1994:
i have a few doubts,paper 21 math MJ 2010:
Questions:
8.b
10
15.a+b
17.c

elemis:
This was the paper I did for my IGCSEs :P PAWNED it :D Give me a minute to write the explanations ;)

HUSH1994:
good,im waitin and Thanks for it dude ;)

elemis:
Oh, actually speaking, this is a different variant from the one I did :P

For 8 b) look at the first link its an excellent powerpoint

For 10

3.5 *5 + 1.5*2 +

I basically used Pythagoras's Theorem to find the length of the diagonal wooden thingy.

For 15
a) 

Hence,

b) We've already found the gradient from (a) hence : y=-2x + c.

Inputing one of the coordinates into this equation : 5 = -2*2 +c

We solve for c. Hence c = 9   

I'm doing the rest.

elemis:
Angle COD is subtended at the centre of the circle by the arc CD.

The angle CED is subtended by the same arc at the CIRCUMFERENCE of the circle.

Hence, you should know that angles subtended by the same arc at the centre are twice those subtended at the circumference.

Hence, CED = 19. And then EDO = 71

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