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y=1/2f
Polowy przekatnych i bok rombu tworza trojkat prostokatny.
x+y=21 ⇒ y=21-x
x²+y²=15²
x²+(21-x)²=15²
x²+441-42x+x²-225=0
2x²-42x+216=0 /:2
x²-21x+108=0
Δ=21²-4*108=441-432=9
x>0
x=(21-3)/2=9 , y=12 lub x=12, y=9.
e=2*12=24
f=2*9=18
P=1/2*24*18 = 216
P=a*h
15*h=216 /:15
h=14,4
r=1/2h
r=7,2