Main Idea: You do not need to know the measures of all pairs of congruent
parts to know that two triangles are congruent. You can use the congruence
instead!

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step-by-step explanation:

dilation scale factor 2: starting with δabc, draw the dilation image of the triangle with a center at the origin and a scale factor of two. notice that every coordinate of the original triangle has been multiplied by the scale factor (x2). dilation with scale factor 2, multiply by 2.