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On dividing the base in 2 equal parts we get 8/2 =4 so now the base is 4cm+4cm. since the 2 equal sides are of 5cm each so on considering half of the triangle we have the base as 4cm, hypotenuse as 5 cm and perpendicular we have to calculate so on following pythagoras theorem we have 5*5=perpendicular *perpendicular+4*4 => 25=x*x + 16 =>25-16=x*x =>9=x*x =>x=√9=3cm.