Area of any triangle is: 0.5*base*perpendicular height
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do you want to know the area in a isosceles triangle or what?
Area of isosceles triangle: 0.5*5*7 = 17.5 square cm
Area of the right isosceles triangle: 0.5*16*16 = 128 square units
isosceles triangle
Area = 1/2*base*height = 0.825 sq cm. The fact that the triangle is isosceles is irrelevant: it makes no difference to its area.