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154= 4.22/7.r²
154.7= 22.4r²
1078=88r²
1078/88 = r²
r= √12,25
r=3,5 m
d= 7m
2. lp = 4πr2
2464= 4.22/7.r²
2464.7=4.22.r²
17248= 88r²
17248/88 = r²
r =√196
r = 14 cm
d = 28 cm
154=4×22/7×r²
154×7=88r²
1078=88r²
r²=1078/88
r²=12,25
r=√12,25
r=3,5m
d=2×3,5=7m
b lp=4×π×r²
2464=4×22/7×r²
2464×7=88r²
17248=88r²
r²=17248/88
=196
r=√196
r=14cm
d=28cm
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