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S√3 = √147
S =√147/√3=√49= 7
Luas Dr = Dr x S = 7 x √147
= 7√147
= 7 √49√3
= 49√3 cm²
digonal sisi
d = s √2
= 7 √2
luas bidag diagonal
L = 7√2 x 7
= 49 √2 cm²