The equation of a circle is x^2 + y^2= 42.25 Find the radius of the circle.
1 answer:
Answer:
radius = 6.5
Step-by-step explanation:
The equation of a circle centred at the origin is
x² + y² = r² ( where r is the radius )
x² + y² = 42.25 ← is in this form
with r² = 42.25 ( take the square root of both sides )
r = 
= 6.5
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