Geometry and TrigonometryMediumRadius from the centre and a point by distance
Geometry and Trigonometry practice question
In the xy-plane, a circle has its centre at (2, 3) and passes through the point (5, 7). What is the radius of the circle?
Answer: 5
The radius is the distance between the points: √(3² + 4²) = 5.
Common wrong answers
- If you answered 1
- 1 subtracts 3 from 4.
- If you answered 7
- 7 adds the coordinate differences 3 and 4.
- If you answered 25
- 25 is the radius squared.
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