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a)
bok a=4cm
PΔ=a²·√3/4=4²·√3/4=16√3/4=4√3 cm²
b)
h=12cm
wzor na h=a√3/2
podstawiamy
a√3/2=12
a√3=12·2
a√3=24
a=24/√3=24√3/3=8√3 cm --->dlugosc boku Δ
a
P= 4²·√3 =16√3 = 4√3cm²
4 4
b
a√3=12 / ÷ √3
a = 12
√3
a=12√3
3
a=4√3