Answer:
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 = = 6.5
6.5m questions
8.6m answers
= 6.5