Which of the following pair(s) of circles have /as a common external tangent? select all that apply.
a and b
a and c
b and c

A and B

A and C

Step-by-step explanation:

Common internal tangents intersect the segment joining the centers of the two circles.

Tangent I is common internal tangent to circles A and B as the line joining the centers of circles will intersect the tangent I.

Tangent I is also a common internal tangent to circle A and C.The line joining the centers of circles A and C intersects tangent I .

Tangent I is not a common internal tangent to circles B and C,

47 - 90 = 43

43 - 180 = x

x = 137