The ten pins are usually automatically set by machine into a triangle with four pins in the back row, then three, then two, and finally one in the front at the center of the lane.
The bowling lane is 60 feet (18.28 metres) from the foul line to the head pin (1-pin); of that distance, there are 15 feet (4.57 metres) from the foul line to the guide arrows.
The bowling lane has two sets of approach dots; from the foul line back to the first set of approach dots is 12 feet (3.65 metres) and to the second set of approach dots is 15 feet (4.57 metres) (an additional 3 feet/91 cm).
The ten pins are automatically set by machine into a triangle with 4 pins in the back row, then 3, 2, and finally 1 in the front, at the centre of the lane.
Obviously, due to the spacing of the pins, it is impossible for the ball to strike every one, therefore a tactical shot is required, which will result in a chain reaction of pin hitting pin.
This is scored by bowling 12 strikes: one for each frame, and a strike with both bonus balls in the 10th frame.
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