tolong kak pakai cara. besok mau dikumpulkan

6.
luas juring
= α / 360° × πr²
= 144 / 360 ° × 22/7 × 7 × 7
= 0,4 × 22 × 7
= 61,6 cm²

7.
r = 1/2 d = 1/2 x 42 = 21

keliling roda
= 2πr
= 2 × 22/7 × 21
= 2 × 22 × 3
= 132 cm

panjang lintasan
= keliling roda × banyak putaran
= 132 × 50
= 6.600 cm
= 66 m