hi zee-f

Very well done for getting 18/20 at first attempt. That's really good!

I can see where you went wrong here with Q15, so I'll do it first.

I choose A it was incorrect I am still working on the correction

What is the length of the arc if

15. r=y n=x

A x*y*pi/90

B x*y*pi/30

C x*y*pi/45

D x*y*pi/27

E x*y*pi/180

F x*y*pi/115

With these problems I first work out the whole circumference, and then work out the fraction for the arc.

So cancel a 2 top and bottom and it's done.

Now for question 10.

What is the circumference of the circle if the radius is:

10. (x + y)pi

A (x+y)/7

B (x+y)/5

C(x+y)/1

D(x+y)/2

E (x+y)/3

F (x+y)/8

So I know the the formula for the circumference of a circle is 2(pi)(r)

So it would be 2(pi)*((x + y)pi) right? but then what do I do ?

What you have done is exactly right so something else is wrong here.

If the radius has a pi in it, the circumference will collect another, giving a pi squared. None of the answers looks right.

If it's a mis-print I can make sense of it. Try this:

What is the radius of the circle if the circumference is:

10. (x + y)pi

A (x+y)/7

B (x+y)/5

C(x+y)/1

D(x+y)/2

E (x+y)/3

F (x+y)/8

This way round it makes sense and one of the answers works.

Bob