Bntuin yg nomor 1 dg 3 yaa,Thx

1. a) Panjang busur
= 30°/360° × K lingkaran
= 1/12 × 2πr
= 1/12 × 2 . 22/7 . 28
= 1/12 × 176
= 14,66 cm

b) L juring
= 30°/360° × L lingkaran
= 1/12 × πr²
= 1/12 × 22/7 . 28 . 28
= 1/12 × 2464
= 205,33 cm²

3. a) L juring AOB
= 90°/360° × L lingkaran
= 1/4 × πr²
= 1/4 × 22/7 . 7 . 7
= 1/4 × 154
= 38,5 cm²

b) L Segitiga
= 1/2r²
= 1/2 . 7 . 7
= 1/2 . 49
= 24,5 cm²

c) L tembereng
= L juring - L segitiga
= 38,5 cm² - 24,5 cm²
= 14 cm²