Hitunglah daerah yang diarsir!

L = L 1 + L 2
L 1 = P × L
= 78 cm × 46 cm
=3.588 cm2
L 2 = 1/2 ×phi ×r×r
= 1/2 ×3,14×23cm×23cm
= 1,57 ×23cm×23cm
= 830,53 cm2
L = 3.588 + 830,53
= 4.418,53 cm2