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1. kolom 3 baris 1
  L=100°/360°.π.r²
  L=5/18.3,14.36
  L= 31,4 cm²


2. kolom 2 baris 2
 L=25°/360°.π.r²
31,4cm²=5/72 . 3,14 . r²
r²=31,4 . (72/5) / 3,14
r²=144cm²
r=√144cm²
r=12cm

3. kolom 1 baris 3

L=α/360°.π,r²
8,478cm²=α/360°.3,14.81
α=8,478.360/(3,14.81)
α=12°