exam Maths Puzzle Numerical Ability

I'm trying to solve the equation of a circle with the following vertics. (0,0), (20,0) and (0,21).

It appears to me that there is no solution. If you plot the points on a graph

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exam Other Question

The sum of two numbers is twice their difference. The larger number is 6 more than twice the smaller. Find the numbers. One benefit of membership in a national honor society is a 25% discount on all history magazine subscriptions. Thomas used this dicount to order an annual subscrition to American Heritage magazine and paid $24. What was the cost of a regular subscription?