Jawab:

Penjelasan dengan langkah-langkah:

1. r = 7 ; t = 24

s² = r² + t² = 7² + 24² = 49 + 576 = 625

s = √625 = 25

Luas = π x r x (r + s)

        = (22/7) x 7 x (7 + 25)

        = 22 x 32

        = 704 cm²

2. d = 16 ⇒ r = 16/2 = 8

s = 17

t² = s² - r² = 17² - 8² = 289 - 64 = 225

t = √225 = 15

Volume = (1/3) x 3.14 x 8² x 15

             = 3.14 x 64 x 5

             = 1004.8

3. a. r = 12/2 = 6

Luas = 4 x 3.14 x 6² = 452.16

Volume = (4/3) x 3.14 x 6³ = 904.32

b. Diameter = 2 x 8 = 16

Luas = 4 x 3.14 x 8² = 803.84

Volume = (4/3) x 3.14 x 8³ = 2143.57

c. Diameter = 2 x 14 = 28

Luas = 4 x (22/7) x 14² = 2464

Volume = (4/3) x (22/7) x 14³ = 11498.67

d. r = 10 cm = 10/10 dm = 1 dm

Luas = 4 x 3.14 x 1² = 12.56 dm²

Volume = (4/3) x 3.14 x 1³ = 4.187 dm³ = 4.187 liter

4. Diameter = 14 ⇒ r = 14/2 = 7

Luas 1/2 bola = 1/2 x 4 x π x r² = 2 x π x r²

Luas alumunium = 2 x (22/7) x 7 x 7 = 308 m²

5. Luas = 154

4 x π x r² = 154

4 x (22/7) x r² = 154

88 x r² = 7 x 154

88 x r² = 1078

r² = 1078/88

r² = 12.25

r =  √12.25 = 3.5 m

Diameter = 3.5 m x 2 = 7 m