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Pelajaran :MatematikaKelas :9
Bab :2
Nama Bab :Bangun Ruang Sisi Lengkung
Kode mapel:2
Kode :9.2.2
Jawab:
s=√r²+t²
=√(7cm)²+(24cm)²
=√49cm²+576cm²
=√625cm²
=25cm
Luas kertas karton=L a+L sel ker
=πr²+πrs
=22/7(10,5cm)²+(22/7)(7cm)(25cm)
=22/7(110,25cm²)+22cm(25cm)
=346,5cm²+550cm²
=896,5cm²