- Arm bone; circle part - Forearm bone - Half-diameter - Range of operation on arm bone - Straight line from the centre of a circle - Straight line from the centre to the circumference of a circle - Surrounding area
- The half of a circle; the part of a circle bounded by
its diameter and half of its circumference. - A semicircumference. - A body in the form of half of a circle, or half of a
circumference. - An instrument for measuring angles.
- Half of a diameter; a right line, or the length of a
right line, drawn from the center of a circle, a sphere, or other
curved figure, to its circumference or periphery; a radius.