56.25 feet
late afternoon (sunset)
There are two factors involved in casting a shadow: the height of the object and the direction (angle) of the light source. Generally, problems like this include the time of day or the angle of the sun or a comparison to some other object. As written, it is not possible to answer this question unequivocally.
84 feet tall
That all depends upon what time of day the shadow was cast. For example, at straight up noon, even a very tall building wouldn't cast much of a shadow, but at sunrise or sunset, even a tiny building might cast an 18 foot long shadow, or even longer.
Designate the unknown shadow length by s. Shadows cast at the same time and place are proportional to the height of the object casing the shadow. Therefore: 4/6 = s/21, or s = [4(21)]/6 = 14 feet.
56.25 feet
late afternoon (sunset)
There are two factors involved in casting a shadow: the height of the object and the direction (angle) of the light source. Generally, problems like this include the time of day or the angle of the sun or a comparison to some other object. As written, it is not possible to answer this question unequivocally.
84 feet tall
4 feet24/16 = 6/x24x = 96x = 4
That all depends upon what time of day the shadow was cast. For example, at straight up noon, even a very tall building wouldn't cast much of a shadow, but at sunrise or sunset, even a tiny building might cast an 18 foot long shadow, or even longer.
It has something to do with what light happens to be around that person at the time. If there happens to be a bright light shining on an object, that object's 'shadow' will cast itself on whatever is around it. +++ More simply, the "something" is the object blocking the direct light from the source. The air scatters the light so the shadow is not very dark - on the air-less Moon a shadow is fully dark.
17.45 feet.
its not
To cast a shadow means to block light from reaching a surface, creating a dark area behind an object due to the obstruction of light. This occurs when an object is in the path of light, causing its silhouette to be projected onto a surface.
That depends where you are on the planet. Your shadow would be longest if you were standing on a rotational pole at the time of equinox. At this point your shadow would be infinity long as it would be "projected" into space. However as a rule of thumb one's shadow is longest when the sun is rising or setting but high enough to cast your shadow.