tolong donggg kerjaiin sekalian pake cara

8. Luas = (21 x 21) - 3.14 x 10.5²
= 441 - 346.185
= 94.815 cm²
9. Luas = 3.14 x 10.5² - 3.14 x 5²
= 346.185 - 78.5
= 78.5 cm²
10. Luas = (17 x 14) + 22/7 x 7² : 2
= 238 - 77
= 161 cm²