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=
=
= 5 cm
5. s = ( a+b+c)
= (20+34+42)
= (96)
= 48 cm
L =
=
=
= = 336 cm²
R =
=
= 21,25 cm
k = 2 π r
= 2 x 3,14 x 21,25
= 133,45 cm