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a)sk=4*3+4*5
sk=12+20
sk=32
b) sk= 6*1+4*6
sk=6+24
sk=30
c) sk=3*4+2,5*3
sk=12+7,5
sk=19,5
d)4*2√3
8√3
e) a²+b²=c²
3²+4²=c²
25=c²
c=5
3²+5²=c²
9+25=c²
34=c²
c=√34
Obw= 3+4+3+5+5+√34
Obw=20 +√34
f) d=a√2
d=2√2√2
d=4
a²+b²=c²
3²+(2√2)²=c²
9+8=c²
c=√17
3²+4²=c²
25=c²
5=c
Obw=4*2√2+3+2+2√17+5
Obw=8√2+2√17+8
: ) that's all