Worksheet triangle by Diana D.

Tighina fortress, Bender,The Republic of Moldova
Triangle ABC is isosceles with AB[math]\equiv[/math]BC,AB=12,AC=24 and BM=4,NC=5.M and N[math]\in[/math] BC.Find MN.
The perimeter of ABC is...
If h=8, the area of ​​the triangle is...
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Information: Worksheet triangle by Diana D.