Geometry and TrigonometryEasy–MediumDiameter from a point and the centre
Geometry and Trigonometry practice question
In the xy-plane, the point (7, 1) lies on a circle whose centre is (−3, 1). What is the diameter of the circle?
Answer: 20
The radius is the distance from (−3, 1) to (7, 1), which is 10, so the diameter is 20.
Common wrong answers
- If you answered 4
- 4 adds the x-coordinates.
- If you answered 10
- 10 is the radius.
- If you answered 100
- 100 is the radius squared.
More Geometry and Trigonometry questions
- Easy–Medium
A circle has a radius of 6. What is its area? (Use A = πr².) - Easy–Medium
A right triangle has legs of length 6 and 8. What is the length of the hypotenuse? - Easy–Medium
A circle has a radius of 5. What is its circumference? (Use C = 2πr.) - Easy–Medium
What is the midpoint of the segment joining the points (2, 3) and (8, 11)? - Easy–Medium
What is the measure, in degrees, of angle B? - Easy–Medium
What is the area, in square centimeters, of the trapezoid?
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