L besar=
×r×r
=22/7×21×21
=22/1×3×21
=22×3×21
=66×21
=1386
L kecil=
=22/7×10,5×10,5
=22×1,5×10,5
=33×10,5
=346,5×2(karna 2 buah lingkaran kecil)
=693
1386-693=693cm²
kalo nggka salah
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L besar=
×r×r
=22/7×21×21
=22/1×3×21
=22×3×21
=66×21
=1386
L kecil=
×r×r
=22/7×10,5×10,5
=22×1,5×10,5
=33×10,5
=346,5×2(karna 2 buah lingkaran kecil)
=693
1386-693=693cm²
kalo nggka salah