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Verified answer
7.- Luas Setengah Lingkaran
Jari - Jari = ½ × D = ½ × 14 dm = 7 dm
L = ½ × πr²
L = ½ × 22/7 × 7 × 7
L = ½ × 22 × 7
L = ½ × 154
L = 77 dm²
- Luas Segitiga
L = ½ × a × t
L = ½ × 14 × 4
L = 14 × 2
L = 28 dm²
- Luas yang Diarsir
L = 77 dm² + 28 dm²
L = 105 dm²
8.
- Luas Persegi
L = s²
L = 21²
L = 441 dm²
- Luas Lingkaran
Jari - Jari = ½ × D = ½ × 21 dm = 10,5 dm
L = πr²
L = 22/7 × 10,5 × 10,5
L = 22 × 1,5 × 10,5
L = 33 × 10,5
L = 346,5 dm²
- Luas yang Diarsir
L = 441 dm² - 346,5 dm²
L = 94,5 dm²
9.
- Luas Lingkaran 1
Jari - Jari = ½ × D = ½ × 10 cm = 5 cm
L = πr²
L = 3,14 × 5 × 5
L = 3,14 × 25
L = 78,5 cm²
- Luas Lingkaran 2
Diameter = 10 cm + 5 cm + 5 cm = 20 cm
Jari - Jari = ½ × D = ½ × 20 cm = 10 cm
L = πr²
L = 3,14 × 10 × 10
L = 314 cm²
- Luas yang Diarsir
L = 314 cm² - 78,5 cm²
L = 235,5 cm²
10.
- Luas Persegi Panjang
L = pl
L = 17 cm × 14 cm
L = 238 cm²
- Luas Setengah Lingkaran
Jari - Jari = ½ × D = ½ × 14 cm = 7 cm
L = ½ × πr²
L = ½ × 22/7 × 7 × 7
L = ½ × 22 × 7
L = ½ × 154
L = 77 cm²
- Luas yang Diarsir
L = 238 cm² + 77 cm²
L = 315 cm²
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