SOLIDS
The area of the circle is π(4)^2 = 16π.
96 . Area of a Sector
A sector is a piece of the area of a circle. If n is the degree measure of the sector’s central angle,
then the formula is
In the figure above, the radius has a length of 6, and the measure of the sector’s central angle is
30 degrees. The sector has of the area of the circle:
97 . Tangency
When a line is tangent to a circle, the radius of the circle is perpendicular to the line at the point
of contact.