Chcem sa opýtať či to mám dobre .Ďakujem Ondrej
VYPOČÍTAJ OBVOD KOSOŠTVORCA, KTORÉHO STRANA MÁ DÍŽKU 7,5CM.
O=4.a
O=4.7,5cm
O=30cm
OBVOD kosoštvorca so stranou dlhou 7,5cm je 30cm
VYPOČÍTAJ OBSAH KOSOŠTVORCA KTORÉHO UHLOPRIEČKY MAJÚ DLZKU 8CM A 6CM
uhlopriečka u1 a u2
S=(u1+u2)÷2
S=(8cm+6cm)÷2
S=48cm÷2
S=24cm2
Obsah kosoštvorca s uhlopriečkami dlhými stranami 8cm a 6cm je 24cm2.
VYPOČÍTAJ DLZKU STRANY ŠTVORCA AK JEHO OBVOD JE 17DM.
O=4a
O=17dm÷4
O=4,25dm
Dĺžka strany štvorca s obvodom 17dn je 4,25dm.
VYPOČÍTAJ OBVOD A OBSAH OBDĹŽNIKA S ROZMERMI 8,5M A 14CM.
14cm=0,14m
O=2 .(a+b)
O=2.(8,5m+0,14m)
O=2.8,64m
O=17,28m
OBVOD obdížnika je 17,28m.
S=a.b
S=8,5m.0,14m
S=1,19m2
Obsah obdĺžnika je 1,19m2
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