langents that exist between the palr of circles, If no commmon tangentexis

Sketch two circles that have: a No common tangents b Exactly two common tangents c Exactly three common tangents d Exactly three common tangents e Exactly four common tangents

Suppose the angle formed by the line y = 3x and the positive x-axis is 6. Find the tangent of (Figure 1). Figure 1

If two ships are 70 nautical miles apart on the ocean, what is the great circle distance between them in radians?