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geometry question

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I'm stumped on this:

 

Which of these describes a unique polygon?

A. A triangle with angles 30 degrees, 50 degrees and 100 degrees

B. A quadrilateral with each side length 5 cm

C. A triangle with side lengths 6cm, 7 cm, and 8 cm

D. A triangle with side lengths 4 cm and 5 cm and a 50 degree angle

 

 Aug 15, 2020

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 #1
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I'm confused at what a unique polygon is......you mean a shape that follows the "unique shape theorem"? Then it would be B, because a square is a regular rectangle, since all sides are equal. 
 

(Also, can you please reply, telling me what a unique polygon is? Thanks!)

 

:)

 Aug 15, 2020

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