Question

Q.

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Answer 1

4. Alas

p = 18 cm

l = 10 cm

t. selimut = 12 cm

Rumus Luas Permukaan

= ( p x l ) + (2 x 1/2 x p x t.selimut) + (2 x 1/2 x l x t.selimut)

= ( 18 x 10 ) + ( 2 x ½ x 18 x 12) + ( 2 x ½ x 10 x 12)

= 180 + 216 + 120

= 516 cm²

V = ⅓ x luas alas x tinggi

V = ⅓ x ( 18 x 10) x 12

V = ⅓ x 180 x 12

V = 180 x 4

V = 720 cm³

5. Prisma segitiga

Alas = 9 cm, 12 cm, 15 cm

tinggi = 20 cm

Luas permukaan = 2 × luas alas + keliling alas × tinggi.

L = 2 x (( ½ x 12 x 9) + ( 12 + 9 + 15)) x 20

L = 2 x ( 54 + 36) x 20

L = 2 x 90 x 20

L = 180 x 20

L = 3.600 cm²

V = (1/2 x a x t) x tinggi prisma

V = (½ x 12 x 9 ) x 20

V = 54 x 20

V = 1080 cm³