The musical term alto, meaning high in Italian (Latin: altus), refers to the second highest part of a contrapuntal musical texture and is also applied to its associated vocal range, especially in choral music. It is also the root word of contralto, the lowest standard female voice type.
circle noun [ C ] (SHAPE) âº geometry a continuous curved line which is always the same distance away from a fixed central point, or the area enclosed by such a line: Colored paper was cut into circles, squares, and triangles. A circle of chairs had been arranged in the center of the room.
The radius of a circle is any line segment from the center of the circle to any point on the circle. The diameter of a circle is any line segment that passes through the center of the circle and has its endpoints on the circle. In any circle, the length of a diameter is twice the length of a radius. Radius and diameter are also used to name length. For example, the radius of the circle is 2 inches and the diameter is 4 inches.