R=7 in
find the surface area of a parallelogram ​

Answer is in the photo. I couldn't attach it here, but uploaded it to a file hosting. link below! Good Luck!

cutt.ly/4zZs6GM

When two circles touch each other internally 1 common tangent can be drawn to the circles. when two circles intersect in two real and distinct points, 2 common tangents can be drawn to the circles. • when two circles touch each other externally, 3 common tangents can be drawn to the circles. • when two circle neither touch nor intersect and one lies outside the other, then 4 common tangents can be drawn.