100 Most Beautiful Secret Areas in China

100 Most Beautiful Secret Areas in China

Matematika berapa luas permukaan benda seperti gambar di atas​

berapa luas permukaan benda seperti gambar di atas​

Jawaban:

Lp. k : π × r × ( r + s )

: ²²/7 × 21 cm × ( 21 cm + 40 cm )

: 22 × 3 cm × 61 cm

: 4.026 cm²

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