Question

Find the radius of the circle whose equation is 3x² + 3y² = 75.

Answer 1

Answer:

A) 5

Step-by-step explanation:

The equation of a circle:

$(x-h)^2+(y-k)^2=r^2$

(h, k) - center

r - radius

We have the equation:

$3x^2+3y^2=75$             divide both sides by 3

$x^2+y^2=25\to r^2=25\to r=\sqrt{25}\to r=5$