The radius of a circle is 1 units. What is the diameter of the circle?

2 units

Step-by-step explanation:

As the radius is half of the  diameter. To work this out you would simply multiply 1 by 2, which gives you 2.

1) Multiply 1 by 2.

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,