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.
A circle is a set of all points in a plane that are all an equal distance from a single point, the center. The distance from a circle's center to a point on the circle is called the radius of the circle. A radius is a line segment with one endpoint at the center of the circle and the other endpoint on the circle. For the circle below AD, DB, and DC are radii of a circle with center D. A line segment that crosses the circle by passing through the center of the circle is called the diameter. The diameter twice the length of the radius. In the circle above AC is the diameter of the circle. A chord is a segment that also has endpoints on the circle, but the line does not need to cross through the center. On the circle below BC and AC are chords. A diameter is a chord that passes through the center of the circle. A secant is a line that intersects with a circle at 2 different points.