Geometry: Tangent Lines

AB and BC are tangents to P. What is the value of x?

A satellite is 13,200 miles from the horizon of Earth. Earth's radius is about 4,000 miles. Find the approximate distance the satellite is from the Earth's surface.

YZ is a tangent to X, and X is the center of the circle. What is the length of the radius of the circle?

The radius of G is 4 cm. Which is a tangent of G?

Circle A is inscribed in a quadrilateral. What is the perimeter of the quadrilateral?