luas permukaan bangun tersebut
Luas permukaan Balok tanpa tutup
= p.l + 2pt + 2lt
= ( 20 × 10 ) + ( 2 × 20 × 8 ) + ( 2 × 10 × 8 )
= 200 + 320 + 160
= 680 cm2
Luas permukaan 1/2 tabung
= 1/2 × 2 × pi × r × ( r + t )
= 1/2 × 2 × 3,14 × 5 × ( 5 + 20 )
= 1/2 × 2 × 3,14 × 5 × 25
= 1/2 × 6,28 × 125
= 1/2 × 785
= 1 × 392,5
= 392,5 cm^2
Luas gabungan
680 + 392,5
1.072,5 cm^2 ( C )
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