tolong bantu ya kak pusing nih

Lp = 2πr × (r + t)
= 2 × 3,14 × (1/2 × d) × {(1/2 × d) + t}
= 2 × 3,14 × (1/2 × 60 cm) × {(1/2 × 60 cm) + 3 cm}
= 2 × 3,14 × 30 cm × (30 cm + 3 cm)
= 188,4 cm × 33 cm
= 6.217,2 cm²