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- luas lingkaran = 22/7 . 7²
= 22/7.49
= 154 cm²
- keliling lingkaran = 22/7 . 14
= 44 cm
jawab :
Panjang busur = a/360 x keliling lingkaran
= 90/360 x 44
= 11 cm
Luas juring = a/360 x luas lingkaran
= 90/360 x 154
= 38,5 cm²
semoga membantu
Luas juring = 90/360 x Luas = 1/4 πr² = 1/4 x 22/7 x 7² = 38,5 cm²