Hitunglah luas daerah yg diarsir ?

4. L = L 1 - L 2
L 1= p ×l
= 30 cm×14 cm
=420 cm2
L 2 = phi ×r ×r : 2
= 22/7 ×7 cm×7 cm :2
= 22 ×7 cm :2
= 154 : 2
=77 cm2
L yg di arsir = 420 cm2 - 77 cm2
= 343 cm2