Kak ini caranya salah apa benar ?

<ul><li><strong>Keliling A</strong></li></ul><p>&nbsp; &nbsp; &nbsp; d = 14 cm</p><p>&nbsp; &nbsp; &nbsp; r = 7 cm</p><p>&nbsp; &nbsp; &nbsp; K = Keliling 1/2 lingkaran + diameter</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= (1/2 x 2 x 𝞹 x r) + diameter</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= (𝞹 x r) + d</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= (22/7 x 7) + 14</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 22+ 14</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 36 cm</p><ul><li><strong>Keliling B</strong></li></ul><p>&nbsp; &nbsp; &nbsp; d = 28 cm</p><p>&nbsp; &nbsp; &nbsp; r = 14 cm</p><p>&nbsp; &nbsp; &nbsp; K = Keliling 1/2 lingkaran + diameter</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = (1/2 x 2 x 𝞹 x r) + diameter</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = (𝞹 x r) + d</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = (22/7 x 14) + 28</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 44 + 28</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 72 cm</p><ul><li><strong>Keliling Bangun&nbsp;</strong></li></ul><p><strong>&nbsp; &nbsp; &nbsp; &nbsp;</strong>K = Keliling A + Keliling B</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 36 cm + 72 cm</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 108 cm</p>