That depends upon the time of day, which day of the year it is and where the person is.
The shadow length depends upon the angle of the sun above the horizon:
shadow_length = height_of_person ÷ TAN(angle_of_sun_above_horizon)
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Depends on the time of day (the angle of the sun). Think of the person as being at a right angle to the ground, and the shadow being the other side. The distance from the person's head to the end of the shadow is the hypotenuse. (a^2 + b^2= c^2) a= height of person, b= shadow. If you have the angle of the sun to the ground, you can use Sine/ Cosine to calculate the length.
The answer depends on what you are actually asking. If you mean 54 ft x the length of 10 legs + the length of 20 arms, then you can express it as "54 ft x (the length of 10 legs + the length of 20 arms)". If you know the actual length of each leg & each arm, then you could add the lengths of each leg & the lengths of each arm & and you could maken an expression such as: "54 ft x (TL leg ft + TL arm ft) If you know the average leg length & average arm length, then you could maken an expression such as: "54 ft x (10 x aver leg len + 20 x aver arm len) Lastly, if you know such lengths, you could multiple 54 x TL length of the appendage to arrive at total square feet number.
width=9 length=18
In therory, infinitely long. In practice, the shadow will fade into dispersed light.
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