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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:

native americans

american indians have appeared on many u.s. coins including the buffalo nickel

benjamin franklin learned a lot about democracy by observing the iroquois indian

the term "indian" originated with christopher columbus. he thought that he had reached the east indies when he landed in america and therefore named the inhabitants indians.

camping

camping can relieve stress and depression

your campfire may be a hazard

long-term campsites include permanent and semi-permanent setups and can lead to closer relationships with neighboring campers

buffalo

buffalo are herbivores and feed on about 60 pounds of plant material and grasses a day.

buffalo are considered to be an adult when they reach 3 years old.

buffalo’s tail can be almost three feet long, and they use it to swap at pesky bugs.