keliling bangun d atas adalah

Diketahui = panjang = 22 cm
                   lebar      = 28 cm
                    π           = 22/7

Ditanya = keliling bangun tersebut

Jawab = keliling lingkaran = 1/2 x π x d
                                           = 1/2 x 22/7 x 28
                                           = 1/2 x 22/7 x 28
                                           = 22 x 2 
                                           = 44 cm

               keliling bangun = 22 + 22 + 28 + 44
                                        = 88 + 28
                                        = 116 cm (C)

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