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Jawaban:
a.L.total=672+308=980cm²
b.L.total=693+378=1.071cm²
c.L.total=1.225+962,5=2.187,5cm²
d.L.total=235,5+150=385,5cm²
Penjelasan dengan langkah-langkah:
a.L.1=p×l
=28×24
=672cm²
L.2=½×π×r²
=½×22/7×14²
=11/7×196
=308cm²
L.total=672+308=980cm²
b.L.1=½×π×r²
=½×22/7×21²
=11/7×441
=693cm²
L.2=½×a×t
=½×42×18
=21×18
=378cm²
L.total=693+378=1.071cm²
c.L.1=s²
=35²
=1.225cm²
L.2=¼×π×r²
=¼×22/7×35²
=½×11/7×1.225
=11/2×175
=962,5cm²
L.total=1.225+962,5=2.187,5cm²
d.L.1=½×(a+b)×t
=½×(10+20)×10
=30×5
=150cm²
L.2=¾×π×r²
=¾×3,14×10²
=¾×3,14×100
=¾×314
=235,5cm²
L.total=235,5+150=385,5cm²