Matematika hitunglah luas Jurong lingkaran berikut bila diketahui: 1) a°=45°dan r =10 cm2) a°=60° dan r =15 cm3) a°=90° dan r =28 cm4) a°=180 dan r =30 cm​

jamalcorwinulv – March 08, 2023

hitunglah luas Jurong lingkaran berikut bila diketahui:
1) a°=45°dan r =10 cm
2) a°=60° dan r =15 cm
3) a°=90° dan r =28 cm
4) a°=180 dan r =30 cm​

Nomor 1

= a/360 × πr²

= 45/360 × 3,14 × (10 cm)²

= 1/8 × 3,14 × 100 cm²

= 1/8 × 314 cm²

= 39,5 cm²

Nomor 2

= a/360 × πr²

= 60/360 × 3,14 × (15 cm)²

= 1/6 × 3,14 × 225 cm²

= 117,75 cm²

Nomor 3

= a/360 × πr²

= 90/360 × 22/7 × (28 cm)²

= 1/4 × 22/7 × 784 cm²

= 22/28 × 784 cm²

= 616 cm²

Nomor 4

= a/360 × πr²

= 180/360 × 3,14 × (30 cm)²

= 1/2 × 3,14 × 900 cm²

= 3,14/2 × 900 cm²

= 1.413 cm²

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