Answer:
Line r
Explanation:
A common internal tangent is a tangent of both circles in which the intersection of the tangent and the line segment joining the centers is not empty.
This means that the tangent and the line segment joining the centers must intersect.
Line s does not intersect AB, the line segment joining the circles. This means line s is not the common internal tangent.
Segment AB is the segment joining the centers; it is not tangent to the circles.
Line r is tangent to both circles and intersects AB; this is the common internal tangent.
∠ CFE and ∠ DFE are adjacent angles and are supplementary, sum to 180°
∠ CFE + 152° = 180° ( subtract 152° from both sides )
∠ CFE = 28°
Step-by-step explanation:
x2^+8x=-20
9x^2=20
x^2=20-9
x^2=11
√x^2=√11
x=√11
