AB=BC=CD=DA prove that they are equal

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,

d. vertex

step-by-step explanation:

c

c

c

c

c

c

c

cc

c

step-by-step explanation:

i think it will be zero as slope has a formula of difference between initial and final distance divided by itz time interval