(答え) |
|
(1) |
6cm×2×3.14× |
30° |
= |
12cm×3.14× |
1 |
= |
3.14cm |
|
|
360° |
12 |
|
(答え) 3.14cm |
|
(2) |
9cm×2×3.14× |
160° |
= |
18cm×3.14× |
4 |
= |
25.12cm |
|
|
360° |
9 |
|
(答え) 25.12cm |
|
(3) |
20cm×2×3.14× |
270° |
= |
40cm×3.14× |
3 |
= |
94.2cm |
|
|
360° |
4 |
|
(答え) 94.2cm |
|
(4) |
10cm×2×3.14× |
72° |
+10cm×2= |
20cm×3.14× |
1 |
+20cm= |
32.56cm |
|
|
360° |
5 |
|
(答え) 32.56cm |
|
(5) |
24cm×2×3.14× |
150° |
+24cm×2= |
48cm×3.14× |
5 |
+48cm= |
110.8cm |
|
|
360° |
12 |
|
(答え) 110.8cm |
|
(6) |
33cm×2×3.14× |
300° |
+33cm×2= |
66cm×3.14× |
5 |
+66cm= |
238.7cm |
|
|
360° |
6 |
|
(答え) 238.7cm |
|
(7) |
4cm×4cm×3.14× |
45° |
= |
16cu×3.14× |
1 |
= |
6.28cu |
|
|
360° |
8 |
|
(答え) 6.28cu |
|
(8) |
6cm×6cm×3.14× |
60° |
= |
6cm×6cm×3.14× |
1 |
= |
18.84cu |
|
|
360° |
6 |
|
(答え) 18.84cu |
|
(9) |
15cm×15cm×3.14× |
144° |
= |
15cm×15cm×3.14× |
2 |
= |
282.6cu |
|
|
360° |
5 |
|
(答え) 282.6cu |
|
(10) |
16cm×16cm×3.14× |
225° |
= |
16cm×16cm×3.14× |
5 |
= |
502.4cu |
|
|
360° |
8 |
|
(答え) 502.4cu |
|
|
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