Tolong dikerjakan dengan caranya

Jawaban:

2). 12.001,8cm²

3). 1.056cm²

Penjelasan dengan langkah-langkah:

2.) LP kerucut= π×r×(r+s)

=3.14×21×(21+49)

=3.14×21×70

=4.615,8

2.)LP tabung =2×π×r×(r+t)

=(2×3.14)×21×(21+35)

=6,28×21×56

=7.385,78

7.385,78+4.615,8=12.001,8cm²

3.). LP tabung

=2×π×r×(r+t)

=2×22/7×7×(7+10)

=2×22×1×17

=748

3. LP bola

=4×22/7×7×7

=4×22×1×7

=616÷2

=308

748+308=1.056