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In the diagram, point "O" represents the center of the circle. Which lines are tangents?

Which of the diagrams correctly illustrates that angle BCA = 36 degrees?

What is the value of angle x?
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What is the value of angle x?

Determine the length of side AB

A tangent line is drawn to a circle with a radius of 5.2 cm, resulting in the formation of triangle XYZ. Angle XZY is 90 degrees. If side YX has a length of 7.6 cm, then what must be the length of side XZ?
How far is the horizon (H) from the skydiver when she leaves the plane?