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Pembahasan :
70° + 60° + sudut matematika ° = 180° [Setengah lingkaran]
130° + sudut matematika ° = 180°
sudut matematika ° = 180° - 130°
sudut matematika ° = 50°
Maka, sudut PKN
= 360° - 80° - 70° - 30° - 60° - 50°
= 70°
Banyak buku PKN
= 70°/50° x 240
= 336 buku.