(答え) |
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(1) |
11cm×11cm×3.14=379.94cu |
(答え) 379.94cu |
(2) |
25m×25m×3.14=1962.5u |
(答え) 1962.5u |
(3) |
60km×60km×3.14=11304ku |
(答え) 11304ku |
(4) |
30m÷2=15m |
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15m×15m×3.14=706.5u |
(答え) 706.5u |
(5) |
24cm÷2=12cm |
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12cm×12cm×3.14=452.16cu |
(答え) 452.16cu |
(6) |
20m×20m×3.14=1256u=12.56a |
(答え) 12.56a |
(7) |
300m×300m×3.14=282600u=28.26ha |
(答え) 28.26ha |
(8) |
140m÷2=70m |
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70m×70m×3.14=15386u=153.86a |
(答え) 153.86a |
(9) |
800m÷2=400m |
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400m×400m×3.14=502400u=50.24ha |
(答え) 50.24ha |
(10) |
1.2km÷2=0.6km=600m |
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600m×600m×3.14=1130400u=113.04ha |
(答え) 113.04ha |
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