Tolong jawab,yang nomor 7,9,dan 10,ty^^

Tolong jawab,yang nomor 7,9,dan 10,ty^^

No 9
π×r×r
=22/7 × 35 × 35
=3.850 Cm

No 10
$pi times r times r$
$3.14 times 45 times 45$
$= 6.358.5$

7. luas lingkaran= π*r²
garis trngah 42 maka jari2nya 42/2= 21
= 22/7*21*21
= 1386cm²

9. L= π*r²
= 22/7*35*35
=3850 cm²

10. L=π*r²
=3,14*45*45
= 6358,5 bisa dibulatkan 6359cm²
smg membantu