tolong dijawab yaaa :)

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p = 1 1/2 L = 3/2L
K = 2(p + L)
84 = 2 ( p + L)
42 = p + L
42 = 3/2 L + L
42 = 3/2 L + 2/2 L
42 = 5/2 L
84 = 5L
L = 16,8 cm

P = 3/2 L
P = 3/2 (16,8)
P = 3 x 8,4
P = 25,2 cm

Luas = P x L
= 25,2 x 16,8
= 423,36 cm²
,................................

Bismillah
jawaban+cara:

P=1 1/2L=3/2L
Kll=2×(p+l)
=3/2L+2/2L
=5/2L
=5L
L=16,8 cm

P=3/2L
P=3/2×(16,8)
P=3×8,4
P=25,2 cm

maka L=p×l
=16,8×25,2
=423,36 cm²





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