15 square cm
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The area of any triangle is (1/2) x (length of the base) x (height). We're sure you can take it from there.
60 sq cm
The area of triangle is : 100.0
Area of the triangle = 0.5*base*height = 0.5*10*15 = 75 square cm Area of the rectangle = base*height = 10*15 = 150 square cm
The area of triangle is : 90.0