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d₁=10
P=40
P=d₁*d₂/2
40=10d₂/2
40=5d₂
d₂=8
z pitagorasa wyznaczymy bok rombu:
5²+4²=a²
25+16=a²
41=a²
a=√41
L=4√41
40 = 1/2 x 10 x q
40 = 5 x q
q = 40 : 5
q = 8
Druga przekątna ma 8 cm
:))
e=10 ob=?
P=40
P=½e*f
½*10*f=40
5*f=40/5
f=8
teraz z twierdzenia Pitagorasa:
5²+4²=c²
25+16=c²
41=c²
c=√41
Ob=√41*4=4√41