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P² = 529
P=√ 529 = 23cm
Panjang = Lebar = 23cm
LP = 2(PL+PT+LT)
= 2(23x23 + 23x20+ 23x20)
= 2(529+460+460)
= 2(1.449)
= 2.898
tinggi balok = 20 cm
p=l= akar 529
p=l= 23 cm
luas:
2 (pl+pt+lt)
2 (23×23 + 23×20 +23×20)
2× (529 + 460 + 460)
2× 1449
= 2898 cm persegi