Question

The equation of a circle is x^2+y^2=42.25
Find the radius of the circle.

Answer 1

radius = 6.5

Explanation:

the equation of a circle centred at the origin is

x² + y² = r² ( r is the radius )

x² + y² = 42.25 ← is the equation of a circle centred at the origin

with r² = 42.25 ( take square root of both sides )

r =
`√(42.25)` = 6.5