tolong lah yh kk please!!! soalNy bsok dKumpul

1. L = ½.¼.phi.d²
½.¼.3.14.20.20
½.¼.1.256
⅛.1.256
= 157 cm²
3. L = ¼.phi. d²
¼. 22/7. 14.14
¼. 616
= 154 cm²