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habis itu 22per 7×21×21
setelah itu 21×21-(22per7×21×21)
=21 ×21
=441 dm
luas lingkaran =phi × r × r
22/7 ×21/2 × 21/2 =165 cm
9. luas persegi panjang =p× l
=17×14
=238
luas lingkaran = phi ×r ×r ×12
= 22/7×14×14×1/2
=77
luas gabungan = 238 +77
=315
15.luas lingkaran =phi ×r×r
=22/7×14×14
=616
luas layang layang =1/2×28×14
=196
luas gabungan =616-196=410
semoga membantu maaf kalo salah