No ngasal !!
50 poin !!
1A.
» Volume Kerucut
= ⅓ × π × r² × tinggi
= ⅓ × 3,14 × 5² × 12
= ⅓ × 3,14 × 25 × 12
= 3,14 × 25 × 4
= 3,14 × 100
= 314 Cm³.
» Volume Tabung
= πr²tinggi
= 3,14 × 5² × 12
= 3,14 × 25 × 12
= 3,14 × 300
= 942 Cm³.
» Volume ½ Bola
= ½(4/3πr³)
= ½ × ( 4/3 × 3,14 × 5³ )
= ½ × ( 4/3 × 392,5 )
= ½ × ( 523,33 )
= 261,67 Cm³
» Volume Gabungan
= 314 + 942 + 261,67
= 1256 + 261,67
= 1.517,67 Cm³.
1B.
» Volume Limas Atas
= ⅓ × Luas Alas × Tinggi
= ⅓ × ( 12 × 12 ) × 10
= ⅓ × 144 × 10
= 48 × 10
= 480 Cm³
» Volume Kubus
= S³
= 12 × 12 × 12
= 144 × 12
= 1.728 Cm³
» Volume Limas Bawah
= ⅓ × Luas Alas × Tinggi
= ⅓ × ( 12 × 12 ) × 12
= ⅓ × 144 × 12
= 48 × 12
= 576 Cm³.
» Volume Gabungan
= 480 + 1728 + 576
= 480 + 2304
= 2.784 Cm³
1C.
» Volume Balok
= Panjang × Lebar × Tinggi
= 20 × 10 × 8
= 20 × 80
= 1.600 Cm³.
» Volume ½ Tabung
= ½ ( π r² t )
= ½ × ( 3,14 × 5² × 20 )
= ½ × ( 3,14 × 25 × 20 )
= ½ × ( 3,14 × 500 )
= ½ × 1570
= 785 Cm³.
» Volume Gabungan
= 1600 + 785
= 2.385 Cm³.
