Angle
A is circumscribed about circle O. What is the length of AB

4

Step-by-step explanation:

In your imagination draw a line through A and O.  Reflect triangle ACO about this line.  Then AB is of the same length as AC:  4.

Similarly, the radii OC and OB have the same length, and so OB = 3.

3,000,540

step-by-step explanation:

answer:  

step-by-step explanation:

here x represents the height of the pole,

and, the height of the shadow of the pole is 12 feet.

also, the angle of elevation from the top of the pole is 40°,

therefore,

by the low of sine,

which is the required equation for finding the value of x,