The answer will depend on what the shape is.
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Perimeter = 174cm (75 +75 +12 +12)
"Penta" = 5 so 75/5 cm
About 387 m^2 1.72*s^2 s=perimeter/5 s=75/5=15 1.72*15*15=387
Perimeter = 3*25 = 75 cm
The answer will depend on what x is.