exam Maths Puzzle Numerical Ability

Please help me. I am having problem with this question.

1. If the diameter of a circle is 1.3 * (10)^-12 meters, then wha is the radius?

Thank you kindly.

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exam Other Question

Using the form y=mx+b,find the equation for ;The line thru the orgin that is perpendicular to the line through (-3,0) and(0,- 3) -3(-x+4) = 3x-12

I tried distributing the first expression:

3x - 12 = 3x - 12

then add 12 to both sides:

3x = 3x

then divide each side by 3:

x = x

is this possible?