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Keliling = 2 (L + P)
70 = 2 ( 2/3P + P)
70 = 2 (5/3p)
70= 10/3P
P = 210/10= 21cm
L = 2/3 x 21 = 14cm
Diagonal²= P² + L²
= 21² + 14²
= 441 + 196 = 637
Diagonal² = 637
Diagonal =√637=25,2388