How to Make a Discus Throwing Sector

Written by lisa magloff
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How to Make a Discus Throwing Sector
Discus is a popular track and field event. (Stade Olympique image by J-F Perigois from

The discus throw is a popular event in track and field competition. Discus is an ancient sport, and was one of the events in the ancient pentathlon, which dates back at least as far as 708 B.C. Competitors must throw the discus from a slightly recessed circle that's 8 feet, 2-1/2 inches in diameter. The discus must land within a 34.92-degree arc marked on the ground in chalk or paint. This arc is the discus sector. It can be of any length, but the left and right boundaries are always defined by the 34.92-degree arc. Marking out a discus sector is simple, but requires at least four people.

Skill level:

Things you need

  • Three tape measures of 100 feet or longer
  • Metal or plastic stakes
  • Spray paint

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  1. 1

    Measure out to a distance of 66 feet from the centre of the throwing circle. Do this with one person standing in the throwing circle, holding one end of one measuring tape, and a second person taking the measuring tape out to the 66-foot mark. The second person should remain in place, holding the tape at the 66-foot mark.

  2. 2

    Have two more people walk out to the 66 foot mark and measure a line 39 feet across, perpendicular to the first measuring tape. Place stakes at both ends of this line -- at zero feet and at 39 feet. The middle of this line (at 19 feet, six inches) should cross the first measuring tape, which can then be removed.

  3. 3

    Measure out from the centre of the throwing circle with two tapes. Person "A" stands in the centre of the throwing circle, holding the ends of two tapes. Two other people, persons "B" and "C," then walk the tapes out to 66 feet. At 66 feet, person B lines their tape up with one of the stakes placed 39 feet apart while person C lines their tape up with the other stake. The three people should now be forming a "V" shape that is 66 feet long and 39 feet wide at the top.

  4. 4

    Walk the sector lines (the sides of the "V" shape) out to 100 feet. To do this, person B and Person C continue to walk to a distance of 100 feet. At 100 feet, they each place a stake in the ground. All three people can now let go of their tape measures.

  5. 5

    Paint the lines. One of the people can now paint or chalk the sector lines on the ground with a can of spray paint, or athletic chalk, using the stakes as a guide. The lines will define an arc of 34.92 degrees that is 100 feet long.

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