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1.1.3.TRIANGLES
Atriangleisathree-sidedpolygon.Trianglescanbeclassifiedaccordingtotheir
sides(Figure1.8)orangles(Figure1.9).
Inviewoflengthsofsidesthereare:
Scalenetriangle–atrianglewithallsidesofdifferentlengths(allinterior
anglesdifferentmeasures).
Isoscelestriangle–atrianglewithatleasttwosidesofequallength(twointe-
rioranglescongruent;thethirdsideiscalledthebase).
Equilateraltriangle–atrianglewithallsidesthesamelength(allinterior
anglescongruent).
Figure1.8.Trianglesclassificationaccordingtotheirsides
Inviewofmeasureofanglesthereare:
Acutetriangle–atrianglewithallinterioranglesacute.
Righttriangle
–atrianglethathasonerightangle.
Obtusetriangle–atrianglethathasoneangleobtuse.
Figure1.9.Trianglesclassificationaccordingtotheirinteriorangles
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