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K =1/2 x 2 x Π x r
=1/2 x 2 x 22/7 x 14
= 44
K = 14 + 14 + 14 + 44
= 86
L = p x l
= 14 x 14
= 196
L = 1/2 x Π x d
= 1/2 x 22/7 x 7
= 11
L = 196 + 11 = 207
B ) bingung
semoga membantu . maaf kalau salah
bangun2(1/2*7*7*22/7)=(3,5*22)=77
bangun gabungan=196+77=273
b. bangun 1=10*10=100
bangun 2 =3/4 * 5*5* 3,14=0,75*25 * 3,14=58,875
maaf kalau salah intinya caranya begitu menurut saya