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Verified answer
S - A = 28 cm2 danS + A = 336 cm2
_______________ -
Cara eliminasi
-2A =-308
A = -308/-2=154
Luas alas =A= luas lingkaran
154 = 22/7 xrxr
154x7/22 =r^2
49 =r^2
7=r
Jari2 alas = 7 cm