Artists demonstrate the way that light reveals form by using saturated colors
changes in value
primary hues
negative shapes
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Artists are able to create the illusion of light using different color and tonal values. Value defines how light or dark a given color or hue can be. Values are best understood when visualized as a scale or gradient, from dark to light. The more tonal variants in an image, the lower the contrast

Explanation:

perimeter = 2l +2w, divide total perimeter by 2 for total length of 1 side and 1 width

172/2 = 86 (  total for 1 side and 1 width)

86-24 = 62 (since length is 24 ft longer subtract 24 then divide by 2 for width)

62/2 = 31

width = 31 feet

length = 31 +24 = 55 feet

check: 31*2 = 62, 55*2 = 110,  110+62 = 172