An equation of the circle whose center is the origin and which passes through the point (3,0) is
A (x – 3)2 + y2 = 9
B (x – 3)2 + y2 = 3
© x2 + y2 = 9
O x + y2 = 3

Explanation:

A circle whose center is and radius , has equation:

The center of circle is  given as origin , therefore:

This circle passes , then the radius of circle is the distance between origin and

=>

Substitute , , and back into original equation:

or

Hope this helps!

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x = 25

step-by-step explanation:

a^2+b^2=c^2

7^2+24^2=c^2

49+576=625

sqrt625=25

x=25

answer: .75 km

step-by-step explanation: