Question

bantuin jwb besok dikumpulin, makasii
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Answer 1

(1) rumus luas permukaan tabung = 2 pi r (r + t)

L.p = 2 pi * 4 * (4 + 8)

= 8 pi (12)

= 96 pi

= 96 * 3,14

= 301,44 cm^2

rumus volume tabung = pi r^2 * tinggi

= 3,14 * 4 * 4 * 8

= 401,92 cm^3

(2) rumus luas permkaan limas segi empat = luas persegi + 4 luas segitiga

luas persegi = 10 * 10 = 100

luas segitiga = 10 * 13 /2 = 65

luas permukaan limas segi empat = 100 + 4 * 65 = 100 + 260 = 360 cm^2

volume limas segi empat = 1/3 * luas persegi * tinggi limas

= 1/3 * 10 * 10 * 12

= 1200 / 3 = 400 cm^3

(3) rumus volume bola = 4/3 pi r^3

= 4/3 * 3,14 * 6 * 6 * 6 = 904,32 cm^3

rumus luas permukaan bola = 4 pi r^2

= 4 * 3,14 * 6 * 6 = 452,16 cm^2

Answer 2

Penjelasan dengan langkah-langkah:

1.)

r = 4 cm

t = 8 cm

Lp = 2πr(r + t)

Lp = 2 × 3,14 × 4(4 + 8)

Lp = 25,12 (12)

Lp = 301,44 cm²

.

V = πr²t

V = 3,14 × 4² × 8

V = 3,14 × 16 × 8

V = 401,96 cm³

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2).

t1 = 12 cm

t2 = 13 cm

S = 10 cm

Lp = La + Ls

Lp = S² + 2 × S × t2

Lp = 10² + 2 × 10 × 13

Lp = 100 + 260

Lp= 360 cm²

.

.

V = ⅓ × La × t1

V = ⅓ × 10² × 12

V = 100 × 4

V = 400 cm³

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3.)

r = 6 cm

Lp = 4πr²

Lp = 4 × 3,14 × 6

Lp = 452,16 cm²

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V = 4/3 × πr³

V = 4/3 × 3,14 × 6³

V = 2.712,96/3

V = 904,32 cm³