Geometrymedium · Past Paper
The radius of the circle 4x^2 + 4y^2 = 100 is:
A100
B10
C5
D25
✓ Correct Answer: C — 5
Divide by 4: x^2 + y^2 = 25. r^2 = 25, so r = 5.
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✓ Correct Answer: C — 5
Divide by 4: x^2 + y^2 = 25. r^2 = 25, so r = 5.
Share this question