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P=½ah |*2
2P=ah |÷a
h=2P/a
b) h=a√3/2 --->a
h=a√3/2 |*2
a√3=2h |:√3
a=2h/√3
c) P=c*d/2 --->d
P=cd/2 |*2
cd=2P |:c
d=2P/c
d) P=1/3*abh--->a
P=⅓abh |*3
abh=3P |:bh
a=3P/bh
e) L= 2 π r ---> r
L=2πr | :2π
r=L/2π
P=1/2*a*h /*2
2P=a*h /:a
h=2P/a
b)
h=a√3/2 /*2
2h=a√3 /√3
a=2h/√3
c)
p=c*d/2 /*2
2p=c*d /c
d=2P/c
d)
P=1/3*abh /*3
3P=abh /bh
a=3P/bh
e)
L= 2πr /2π
r= L/2π