first or last quarter
first or last quarter
Half-moon during the first and third (last) quarter phases.
Half a circle is called a semicircle
a hemisphere
Half a circle is called a semi-circle. Sometimes it is called a half-moon.
Half a circle is called a "semicircle" in geometry.
semicircleA half circle is called a semicircle.Half a circle is a semi-circle
That's the "gibbous" phase.
Semi = half
Half the diameter of a circle is called its radius.
A semi-circle
half of the radius the radius is half of the diameter the diameter is the with of the circle. This also can be called a quadrent circle.