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Jawaban:
Nomor 27
Keliling
- k = π × d
- k = 22/7 × (14 × 2)
- k = 22/7 × 28
- k = 22 × 4
- k = 88 cm (B) ✔
Nomor 28
Jari jari
- l = π × r²
- 314 = 3,14 × r²
- r² = 314 : 3,14
- r² = √100
- r = 10
Keliling
- k = π × d
- k = 3,14 × 20
- k = 62,8 (B) ✔
Nomor 29
Luas
- l = π × r²
- l = 3,14 × 7,5²
- l = 3,14 × 56,25
- l = 176,625 cm² (C) ✔
Nomor 30
Luas
- l = π × r² × ¾
- l = 22/7 × 14² × ¾
- l = 22/7 × 196 × ¾
- l = 22 × 28 × ¾
- l = 616 × ¾
- l = 462 cm² (B) ✔
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Jawaban:
27. b
28. b
29. c
30. g nampak arisannya
Penjelasan dengan langkah-langkah:
27. r = 14
keliling = π.d = 22/7 . 28
keliling = 22.4 = 88cm (b)
28. luas = π.r² = 314cm²
314/3.14 = r²
100 = r²
r =√100 = 10cm
keliling = π.d = 3.14 x 20 = 62.8cm(b)
29.diameter = 15
radius = 15/2 =7.5
luas = π.r²
luas = 3.14 . 7.5 . 7.5
luas = 176.625cm² (c)
30. maaf g gitu nampak arsirannya
luas = π.r²
r = 14cm
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