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panjangnya = 2l-5= 36,6-5 = 31,6cm
2l=36,6, lebar = 36,6:2= 18,3cm
jadi (31,6x2)+(18,3x2)= 99,8cm²
maaf yaa klo salah...
2(P+L) = Keliling
2( 2L-5 +L) = 100
3L-5 = 100/2
3L - 5 = 50
3L = 55
L(Lebar) =55/3 atau 18 1/3 atau 18,33
P = 2(55/3) - 5
P= 110 /3 - 15/3
P(Panjang)= 95/3 atau 31,67 atau 31 2/3