A shadow is formed when light is blocked by an object.
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the angle at which a shadow is formed
longest
an angle (that can be on the earth) at which an angle could be formed by the sun.
Grease paper is translucent. It let's a bit of light through but not all. Card board is opaque. It lets no light through. Therefore, the shadow cast by cardboard will be darker and more defined whereas the grease paper lets light through, making the shadow lighter and less focused.
84 feet tall