题目内容
如图中阴影部分的周长是(π取3.14)…( )

| A.25.12 | B.29.12 | C.33.12 | D.37.12 |
S1的周长为:
×3.14×2×4+
×3.14×2×(2+2)+(2+2)
=6.28+6.28+4,
=12.56+4,
=16.56,
S2的周长为:
×2×3.14×4+
×3.14×2×4+(2+2)
=6.28+6.28+4,
=12.56+4,
=16.56,
图中阴影部分的周长为:16.56+16.56=33.12,
故答案为:C.
| 1 |
| 4 |
| 1 |
| 4 |
=6.28+6.28+4,
=12.56+4,
=16.56,
S2的周长为:
| 1 |
| 4 |
| 1 |
| 4 |
=6.28+6.28+4,
=12.56+4,
=16.56,
图中阴影部分的周长为:16.56+16.56=33.12,
故答案为:C.
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