1 ) Diketahui :
Alas = 26 cm
Jari - Jari = 7 cm
Tinggi = 2r = 2 (7) = 14 cm
Penyelesaian :
Luas Jajargenjang = a × t
= 26 cm × 14 cm
= 364 cm²
Luas Lingkaran = πr²
= 22/7 × 7²
= 22/7 × 49
= 1.078/7
= 154 cm²
Luas Daerah yang diarsir = Luas Jajargenjang - Luas Lingkaran
= 364 cm² - 154 cm²
= 210 cm² ( A )
2 ) Diketahui :
Jari - jari = 56 cm
Banyak Bagian = 16 bagian
Diarsir = 11 bagian
= 22/7 × 56²
= 22/7 × 3.136
= 22 × 448
= 9.856 cm²
Luas yang Diarsir = Banyak Diarsir / Total × Luas Lingkaran
= 11 / 16 × 9.856
= 11 × 616
= 6.776 cm² ( A )
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1 ) Diketahui :
Alas = 26 cm
Jari - Jari = 7 cm
Tinggi = 2r = 2 (7) = 14 cm
Penyelesaian :
Luas Jajargenjang = a × t
= 26 cm × 14 cm
= 364 cm²
Luas Lingkaran = πr²
= 22/7 × 7²
= 22/7 × 49
= 1.078/7
= 154 cm²
Luas Daerah yang diarsir = Luas Jajargenjang - Luas Lingkaran
= 364 cm² - 154 cm²
= 210 cm² ( A )
2 ) Diketahui :
Jari - jari = 56 cm
Banyak Bagian = 16 bagian
Diarsir = 11 bagian
Penyelesaian :
Luas Lingkaran = πr²
= 22/7 × 56²
= 22/7 × 3.136
= 22 × 448
= 9.856 cm²
Luas yang Diarsir = Banyak Diarsir / Total × Luas Lingkaran
= 11 / 16 × 9.856
= 11 × 616
= 6.776 cm² ( A )