Find the equation of the circle graphed below.
A) $\quad x ^ { 2 } + y ^ { 2 } = 1$
B) $\quad x ^ { 2 } + y ^ { 2 } = 25$
C) $x ^ { 2 } + y ^ { 2 } = 5$
D) $x ^ { 2 } + y = 25$
E) $y ^ { 2 } = x ^ { 2 } + 25$

Question

Find the equation of the circle graphed below. 
A) $\quad x ^ { 2 } + y ^ { 2 } = 1$ 
B) $\quad x ^ { 2 } + y ^ { 2 } = 25$ 
C) $x ^ { 2 } + y ^ { 2 } = 5$ 
D) $x ^ { 2 } + y = 25$ 
E) $y ^ { 2 } = x ^ { 2 } + 25$

Quizplus · Accepted Answer

The circle is centered at the origin and has a radius of 5 (half the distance between the points on the x-axis). So, the equation of the circle is $x^2 + y^2 = 25$.

Find the Equation of the Circle Graphed Below x2+y2=1\quad x ^ { 2 } + y ^ { 2 } = 1x2+y2=1

Find the Equation of the Circle Graphed Below $\quad x ^ { 2 } + y ^ { 2 } = 1$