Answer:
r = 10
Explanation:
The equation of a circle centred at the origin is
x² + y² = r² ( r is the radius )
x² + y² = 100 ← is a circle centred at the origin with
r² = 100 ( take the square root of both sides )
r = = 10
add multiply divide or subtract make sure to use Pemdas then and you should have your answer
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