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O=l+2r obwód figury
a)
l=90*12π/180 =6π
O=6π+2*12 =6π+24 =6(4+π)
b)
l=60*15π/180 =5π
O=5π+2*15 =5π+30 =5(6+π)
c)
l=135*20π/180 =15π
O=15π+2*20 =15π+40 =5(8+π)
d)
l=120*12π/180 =8π
O=8π+2*12 =8π+24 =8(3+π)
e)
l=200*15π/180 =16 2/3 π
O=16 2/3 π+2*15 =(30+16 2/3 π)