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area of an isosceles triangle = 1/2 * base * height 
and area for scalar triangle = √ s (s-a)(s-b)(s-c)
  i hope it helps...........................^_^
1 4 1
2× (base + height)

please mark as best.
0 0 0
oh sorry by mistake mine is wrong
it is 1/2 ×base × height
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