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I have an answer. So start with the left side. It’s a rectangle area minus the top triangle area.

The right side is a rectangle minus a quarter of a circle.

So since it gives you r=30mm you can use that to find the area of the circle. And take one fourth if that area.

Since the circle is already in quarters. The r is also the lengths of those sides. So each rectangle ends up being 50mm tall

Explanation:

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the tariff was created to protect industry in the northern part of the united states. industries in the north were being driven out of business by imported goods that were priced at a low rate. the goal was to protect these industries   by taxing the goods.