For #1 an ex is
Length is 7
Hight is 15 7x2 =14. 15x2. is 30 30plus 14 is 44. 44 for perimeter .
7x15 is 105
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#2
Side =5. 4x5 is 20. Perimeter is 20. 4x4 is 8 area is 8.
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#3
Base = 54 hight is 3 54x3 is 162 162 divided by 2 is 81.