For the concentric circles, the outer circle radius is r=6 in while that of the inner circle is r=3 in. find the exact area of the annulus (ring) that is determined by the two circles.

The exact area of the annulus (ring) made by the two circle is

Step-by-step explanation:

Given:

Let the radius of outer circle i.e CA be

Let the radius of inner circle i.e CB be

The diagram is given below as attachment.

Substituting the values we get

answer: (c) m∠qpo + (2x + 16)° = 180°

step-by-step explanation:

the opposite angles of a quadrilateral are supplementary.

so, ∠o + ∠q = 180°   and   ∠p + ∠r = 180°

since ∠r = 2x + 16°, we can use substitution as follows:

∠p + ∠r = 180°

∠p + (2x + 16)° = 180°