Geometry and TrigonometryEasy–MediumRadius from the distance around a pond
Geometry and Trigonometry practice question
The distance around the edge of a circular pond is 10π metres. What is the radius of the pond, in metres?
Answer: 5
Circumference 2πr = 10π, so r = 5.
Common wrong answers
- If you answered 10
- 10 is the diameter (or the circumference with π stripped off); the radius is half of that.
- If you answered 25
- 25 is r², which would relate to the area, not the circumference.
- If you answered 3.18
- 3.18 is 10/π, dividing by π as well as forgetting the 2.
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?
Not affiliated with the College Board. SAT is a trademark of the College Board.