Եռանկյան միջնագծերը, կիսորդները և բարձրությունները
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BC=45:3=15
AB=(40-15):2=12.5
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P=AB+AC+BC=32
PABM=AB+BC:2+AM=24
32:2=16
24=AM+16
AM=8
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CD=BD, <1=<2, AD=AD, CD=CD=>եռ. ACD=եռ.ABD=>AC=AB
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AB=BC, <1=1300
<1+<2=1800
180-130=500
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CA=C1A1, MA=M1A1, <1=<2=>եռ.CMA=եռ.C1M1A1=>CM=C1M1