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3a=27 .../:3
a=9 cm
P=a²√3/4
P=9²√3/4
P=81√3/4 cm²
b)
a√3/2=12√3 .../*2
a√3=24√3 .../:√3
a=24 cm
3a=3*24=72 cm
P=a²√3/4
P=9²√3 /4
P=28,25√3cm²=48,9cm²
b)h=a√3 /2
12√3=a√3 /2
24√3=a√3
a=24
Ob=72
Obwód=3*a=27cm
a=27÷3
a=9cm
Pole=(a²√3)÷4
Pole=(81√3)÷4
Pole≈35 cm²
b)
h=12√3=(a√3)÷2
a=(2*12√3)÷√3
a=24 cm
Obwód=3*a=3*24=72 cm