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2. 1386=22/7 Rpangkat2
1386*7=22 R pangkat 2
9702/22=rpangkat 2
akar441=r
21 cm=r
3. 2826= 3.14 * r pangkat2
2826/3,14= r pangkat 2
akar 900=r
30 dm = r
#semoga membantu.. :)