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h=2.5√3
a= ?
x=?
h=(a√3):2
2.5√3=(a√3):2 /*2
5√3=a√3 /:√3
5=a
13²=x²+5²
169=x²+25 /-25
144=x² /√
12=x
2)
d-przekątna podstawy
a-5
x-?
d=a√2=5√2
(5√2)²+x²=20²
50+x²=400 /-50
x²=350 /√
x= √350
x=14√5