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Panjang sisi setengah lingkaran
= 1/2 x π x D
= 1/2 x 22/7 x 7
= 11 cm
Keliling gabungan
= (3 x 7 cm) + 11 cm
= 21 cm + 11 cm
= 32 cm
________________________
Keliling 3/4 lingkaran
= 3/4 x 2 x π x r + 2 x r
= 3/2 x 22/7 x 14 + 2 x 14
= 3/2 x 22 x 2 + 28
= 66 + 28
= 94 cm