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289=s²
s=√289
s=17 cm
K=4 x s
=4 x 17
=68 cm
30.1/2 x d₁ x d₂
1/2 x 18 x 20
=180 cm
27) b
28) b
29) a
30) a
31) b
nomor 32 saya agak bingung
semoga benar dan membantu ^^