So a square has 4 sides so let's calculate the perimeter of the square,
7 × (4) = 28
Making answer choice B) 28 wrong since that is the perimeter of the square only.
Since it is an equilateral triangle meaning all three sides are equal, it will be unsolvable if the triangle has different sides but assuming that it's lengths are also 7 and that the triangle is on top directly of the square then since a triangle has 3 sides,
7 × (3) = 21
BUT, since one side of the triangle was already accounted for then it will be,
7 × (2) = 14
28 + 14 = 42
To conclude, your answer is D) 42 cm.
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I hope that helps you out!!
Any more questions, please feel free to ask me!!
;)
~Zoey
