how to measure the size of an object in my image

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Hi Im looking for a way to measure both the length and the width of the crack in my image when I input the size of the image. what would be the best way to go about this?
Cracked metal.jpg
I start of with this image and my program turns it into this
Capture.PNG
I already have a function tracing the exterior of this but do not know how to continue
B = bwboundaries(K)

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