Jawaban:
1. Luas kolam ikan = π x r²
= 3,14 x (1,5)² = 7,065 m²
2. Jari-jari kain = √(luas / π)
= √(5.544 / 3,14) = 42,1 cm
3. Luas permukaan meja = (keliling / 2π)² x π
= (352 / 6,28)² x 3,14 = 1.963,4 cm²
4. Luas lingkaran = π x r²
= 3,14 x (40 / 2)² = 1.256 cm²
Keliling lingkaran = 2 x π x r
= 2 x 3,14 x (40 / 2) = 125,6 cm
5. Jari-jari stadion = keliling / 2π
= 1.056 / 6,28 = 168 m
Luas stadion = π x r²
= 3,14 x (168)² = 88.387,2 m²
6. Luas permukaan meja = π x r²
= 3,14 x (2 / 2)² = 3,14 m²
7. Luas tanah = π x r²
= 3,14 x (5,6 / 2)² = 24,6192 m²
8. Jari-jari meja = diameter / 2
= 70 / 2 = 35 cm
Keliling meja = 2 x π x r
= 2 x 3,14 x 35 = 219,8 cm
Luas meja = π x r²
= 3,14 x (35)² = 3.846,5 cm²
9. Jari-jari kolam = diameter / 2
= 20 / 2 = 10 m
Keliling kolam = 2 x π x r
= 2 x 3,14 x 10 = 62,8 m
Lintasan yang ditempuh = keliling x putaran
= 62,8 x 10 = 628 m
10. Jari-jari kolam = √(luas / π)
= √(154 / 3,14) = 7 m
= 2 x 3,14 x 7 = 43,96 m
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Jawaban:
1. Luas kolam ikan = π x r²
= 3,14 x (1,5)² = 7,065 m²
2. Jari-jari kain = √(luas / π)
= √(5.544 / 3,14) = 42,1 cm
3. Luas permukaan meja = (keliling / 2π)² x π
= (352 / 6,28)² x 3,14 = 1.963,4 cm²
4. Luas lingkaran = π x r²
= 3,14 x (40 / 2)² = 1.256 cm²
Keliling lingkaran = 2 x π x r
= 2 x 3,14 x (40 / 2) = 125,6 cm
5. Jari-jari stadion = keliling / 2π
= 1.056 / 6,28 = 168 m
Luas stadion = π x r²
= 3,14 x (168)² = 88.387,2 m²
6. Luas permukaan meja = π x r²
= 3,14 x (2 / 2)² = 3,14 m²
7. Luas tanah = π x r²
= 3,14 x (5,6 / 2)² = 24,6192 m²
8. Jari-jari meja = diameter / 2
= 70 / 2 = 35 cm
Keliling meja = 2 x π x r
= 2 x 3,14 x 35 = 219,8 cm
Luas meja = π x r²
= 3,14 x (35)² = 3.846,5 cm²
9. Jari-jari kolam = diameter / 2
= 20 / 2 = 10 m
Keliling kolam = 2 x π x r
= 2 x 3,14 x 10 = 62,8 m
Lintasan yang ditempuh = keliling x putaran
= 62,8 x 10 = 628 m
10. Jari-jari kolam = √(luas / π)
= √(154 / 3,14) = 7 m
Keliling kolam = 2 x π x r
= 2 x 3,14 x 7 = 43,96 m