25. luas bangun tersebut adalah 27. ..... 28. volume bangun adalah

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Mapel : Matematika
Tentang : Bangun Datar dan Bangun Ruang
Jumlah pertanyaan yg diajukan : 3
Pembahasan :

Nomor 25 :

Diketahui :

- ½ Lingkaran :
• d = 28 cm
• r = 28/2 = 14 cm

- Segitiga :
• t = 33 cm
• a = 28 cm

Ditanya :
- L Total

LL = ½ x π x r²
LL = ½ x 22/7 x 14 x 14
LL = ½ x 22 x 2 x 14
LL = 11 x 2 x 14
LL = 22 x 14
LL = 308 cm²

LS = ½ x a x t
LS = ½ x 28 x 33
LS = 14 x 33
LS = 462 cm²

L Total : 308 + 462 = 770 cm²
Jawaban : D

Nomor : 27

Diketahui :
- s = 28 cm
- 5/7 berisi air

Ditanya :
- V Air

V = s x s x s (s³)
V = 28 x 28 x 28
V = 784 x 28
V = 21952 cm³

V = 5/7 x 21952 = 15680 cm³

Jawaban : C

Nomor 28 :

Diketahui :
- t = 15 cm
- a = 20 cm
- tp = 31 cm

Ditanya :
- V

V = La x t
V = ½ x 20 x 15 x 31
V = 10 x 15 x 31
V = 150 x 31
V = 4650 cm³

Jawaban : C

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