In the figure, what is the value of angle x? This problem is known as Langley's Adventitious Angles. It is also known as the hardest easy geometry problem because it can be solved by elementary methods but it is notoriously difficult to work out. Can you ...

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https://tapintoteenminds.com/3act-math/cones-and-spheres/ In a previous 3 Act Math Task, students watch a short video that shows a cone pouring water twice into a sphere with the same radius/height to fill it to the top. Because it takes two cones to fil...

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How to find the area of a rhombus in Geometry. It's so good, everybody's doing it....