Circle Diameter from equation: x² + y² = r² GCSE question

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How to find the diameter from the equation of a circle
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Thanks for your help, studying during lockdown for the GCSE that I'm not doing.

kingcosmore
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Hello, can anybody please help me ?
Let x and y be two natural numbers such that: x² + y² = 61 (*)
1. Show that if x<y then x ≤5 ≤y
2. Determine the pairs (x, y) satisfying (*)

justsomeone
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Alguem me ajuda a fazer essa por favor?
Identifique as quádricas representadas pela equação 8x²+4y²+2z²-24=0

Thiagovidalokka