Tolong dong jawaban nomor satu dan dua

1. Lp = 4 × phi × r²
= 4 × 22/7 × 3,5 × 3,5
= 308 cm²

2. Lp = 4 × phi × r²
803,84 = 4 × 3,14 × r²
803,84 = 12,56 × r²
r² = 803,84 / 12,56
r² = 64
r = √64
r = 8 cm