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luas juring = α/360 x πr²
maka
70/360 x 3,14 x 10²
7/36 x 3,14 x 100
7/36 x 314
2198/36
61, 0556 cm²
70/360 = L. jrng/phi r^2
70/360 = L. jrng/ 3,14 * 100
70/360 = L. jrng/ 314
70/360 * 314 = L. jrng
61 cm^2 = L. jrng
kira-kira segitu ..