## waheguru 3 years ago The lenght from the center of teh circle to a point on the circle is r = square root of 40 what is the length of the radius the answer is 2 and squareroot 10?

1. anonymous

$\sqrt{40} = \sqrt{4}\times\sqrt{10}=2\sqrt{10}$

2. waheguru

oh THANK YOU

3. waheguru

:)

4. waheguru

but the first number has to be a perfec square right?

5. anonymous

Yes

6. anonymous

You can pull out any perfect squares.

7. anonymous

Since $$40=2\cdot 2\cdot 2\cdot 5$$ you can pull out the $$2\cdot 2$$, and he $$2\cdot 5$$ remains inside.