4. From the top of a lighthouse, the angle of depression to a buoy is 20°. If the top of the lighthouse is 140 feet above sea level, find the distance from the buoy to the foot of the lighthouse.

the answer is  

a.

4,624π mm2

step-by-step explanation:

he has 140 chickens because he has 10 times more chickens than ducks and he has 14 ducks so 14*10=140

the circumference of a circle is, 10.676 cm.

step-by-step explanation:

the formula for circumference of a circle is given by:

where

c is the circumference of a circle and

d is the diameter of a circle.

given: diameter(d) = 3.4 cm and use

substitute these values in [1] we get;

cm

therefore, the circumference of a circle is, 10.676 cm