Answer is B. 48
By circle theorem, the angle at the centre of the circle is twice the angle at the circumference.
I can't see the picture..
E) sqrt(30)
This is a nice problem. It was helpful to read the topic at the top.
Notice that the two right triangles are similar. Their sides are in proportion.
That is the side '3' is what 'x' is in the other triangle (you need to rotate it!)
Then 'x' is similar to '10'
3/x=x/10 ---> x^2=30, x=sqrt(30)
If you are patient, you can check that for sqrt(30) pythagoras theorem works for all the triangles.
Best
Then
I don't think giving you the exact answers would help, so here are the formulas:
For #1:
We're solving for a.
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