Question

Tolong Dijawab dengan caranya Besok dikumpul

Answer 1

Verified answer

Jawab :

◀14▶
L. juring = 90°/360° × L.O
78,5 = 1/4 × 22/7 × r²
314 = 22/7 × r²
2198 = 22 × r²
r² = 2198/22
r² = 99,909 cm
dibulatkan
r² = 100 cm
r = √100
r = 10 cm ____(B)

◀15▶
Soalnya kurang jelas

◀16▶
P. busur = x/360° × K.O
16,5 = x/360° × 22/7 × 42
5940 = x × 22/7 × 42
5940/22 = x/7 × 42
42 × x/7 = 270
6x = 270
x = 270/6
x = 45° _____(A)

◀17▶
P. busur = 60°/360° × KO
P. b = 1/6 × 2 × 22/7 × 21
P.b = 1/6 × 44 × 3
P.b = 1/2 × 44
P.b = 22 cm _____(B)

◀18▶
p² = l² + (R - r)²
p² = 12² + (9-4)²
p² = 12² + 5²
p² = 144 + 25
p = √169
p = 13 cm ______(B)

◀19▶
d² = p² - (R + r)²
d² = 7,5² - (2,5 + 2)²
d² = 56,25 - 4,5²
d² = 56,25 - 20,25
d = √36
d = 6 cm _______(C)

◀20▶
(R - r)² = p² - l²
1,5² - r² = 2,5² - 2,4²
2,25 - r² = 6,25 - 5,76
- r² = 0,49 - 2,25
r = √1,75
r = 1,32287566
dibulatkan
r = 1 cm

Diameter = 2 × r
Diameter = 2 × 1 cm
Diameter = 2 cm ______(D)

Semoga bermanfaat......