2012 · Q17
AB is a straight line. C is a point whose distance from AB is 3 cm. What is the number of points which are at a distance of 1 cm from AB and 5 cm from C?
Elementary MathematicsGeometry
- A1
- B2
- C3
- D4
Explanation
The two lines parallel to AB at distance 1 cm are at distances 2 cm and 4 cm from C; the circle of radius 5 cm about C meets each in two points, giving 4 points.