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Kolmnurga ümbermõõt
Jälgi, kuidas arvutatakse kolmnurga ümbermõõtu!
1) Kolmnurga küljed on 12 cm, 10 cm ja 9 cm. Leia kolmnurga külgede pikkuste summa.
2) Võrdkülgse kolmnurga külg on 11 cm. Arvuta kolmnurga külgede pikkuste summa.