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3p = 4l
p = 4/3 l
K = 2p + 2l
84 = 2(4/3 l) + 2l
84 = 8/3 l + 2l
84 =
504 = 28l
l = 504 : 28 ⇒ lebar = 18 cm
p = 4/3 × 18 = 24 cm
diagonal = √p² + l²
= √24² + 18²
= √576 + 324
= √900
diagonal = 30 cm
semoga membantu :)
= x 42 = 24