the number before x and y must be the same ex. (2x,2y) (.5x,.5y)
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No because Similar figures are the same shape, angles, and types but not lengths. Congruent means EXACTLY the same in everything.
Take the triangle for instance, there are 3 types. One is the same on each side which is the equilateral. But the other 2 types are flat on 2 sides and diagonal on the other side.
rectilinear figures are - 1.rectangle 2.triangle 3.hexagon 4.square.etc
Accurately known digits along with first doubtful digit are called significant figures.
There are two types of significant figures, measured and exact. Numbers are often rounded to avoid reporting insignificant figures. Numbers can also be rounded merely for simplicity rather than to indicate a given precision of measurement.