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Divide the length of a side of one triangle by the length of the corresponding side of the other triangle.
The ratio of the length of the side in the big triangle to the length of the corresponding side in the little triangle is the scale factor.
11 1/2 to 4 1/4
Not too sure about the question as there is no triangle pictured at the right. But in general the area of a triangle is 0.5*base*perpendicular height
Its area is 0.5*36*48 = 864 square cm and it is a right angle triangle