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240.2= 30 X d2
480= 30d2
d2= 480/30
d2= 16 cm
mencari sisi miring
di= 30/2= 15 cm
d2= 16/2= 8 cm
sisi miring= akar (15)2 + (8)2
= akar 225 + 64
= akar 289= 17 cm
kll: 4 X sisi
: 4 X 17= 68 cm
semoga membantu :)