Cool Tees is having a Back to School sale where all t-shirts are discounted by 15%. Joshua wants to buy
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A polygon cannot have curved sides. Examples of polygons include a triangle, square, rectangle, or any unnamed shape that is closed in, and has straight sides. ... A quadrilateral is a special kind of polygon that has exactly four sides that are all line segments.
In order to solve this triangle we must use cosine law:
Now let's plug in the values we are given:
Now let's plug in the values we are given: