3. Hitunglah luas seluruh permukaan bangun di
bawah ini!
bawah ini!
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Jawaban:
1. Luas Bola = 1/2 x 4 × π × r²
= 1/2 x 4 x 22/7 x 7 x 7
= 1/2 x 4 x 22 x 7
= 2 x 154
= 308cm²
2Luas Tbng = 2 x π x r x (r + t)
= 2 x 22/7 x 7 x (7 + 10)
= 2 x 22 x 17
= 2 x 374
= 748cm²
Luas Seluruh Bangun = 748 + 308
= 1.056cm²