Tolong dijawab no 4 dan 5 mau di kumpulin pakai caranya

4.L¹=9×19
=171 cm²

L²=5×19
=95 cm²

L¹+L²=171+95
=266 cm²

5.L¹=20×20
=400 cm²

L²=3,14×10×10×½
=314×½
=157 cm²

L¹-L²=400-157
=243 cm²

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