207/8 is the right
the ratio of the perimeters is equal to the scale.
the ratio of the areas is equal to the square of the scale.
34 / 20 = k
a / 19.6 = k²
a / 19.6 = (34 / 20)²
a = 19.6 (34 / 20)²
a ≈ 56.6
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°,
by the low of sine,
which is the required equation for finding the value of x,