What is the radius of the circle: x^2+y^2=4 1. (0, -4)
2. (0, 4)
3. (2, -4)
4. (0, 0)

radius = 2

Step-by-step explanation:

The equation of a circle centred at the origin is

x² + y² = r² ( where r is the radius )

x² + y² = 4 ← is in this form

with r² = 4 ⇒ r = = 2

centre (0, 0 ) and radius = 2

m a t h w a y. c o m

step-by-step explanation:

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step-by-step explanation: