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{{ printedBook.courseTrack.name }} {{ printedBook.name }} We will begin by drawing a line through each vertex of $△ABC$ that is perpendicular to line $ℓ.$

Now, we will measure the distance from each vertex to line $ℓ.$ Then, we will locate each reflected point the same distance from line $ℓ$ on the opposite side. Notice that point $A$ is on the line of reflection, so point $A_{′}$ will be also on the same location.

To complete the reflection, we will finally connect the reflected points to have the image of $△ABC.$