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Segitiga 2 = = = 6 cm²
Persegi panjang = p x l = 8 x 5 = 40 cm²
Luas = 6 + 6 + 40 = 52 cm²
5. Luas karton = 75 × 75 = 5625 cm²
Luas lingkaran (lampion) = π r²
= 3,14 . 4²
= 3.14 . 16
= 50,24 cm²
24 Lingkaran = 24 × 50,24 = 1205,76
Karton yg tidak terpakai adalah 5625 cm² - 1205,76 cm² = 4419,24 cm²
6. Prisma segitiga
V = L alas × t
V = (10×9) x 24
V = 90 × 24
V = 2160 cm³
Volume dalam liter (dm³) adalah 2,160 liter