a rectangle and octagon are alike because they both are quadrilaterals.
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Some cross sections are rectangle and octagon.
both are a rectangular
One similarity is that they are both polygons, and they are both geometric shapes.
Five shapes that can be constructed are octagon, hexagon, square, triangle, and rectangle.
a triangle is 180 degrees a square is 2 triangles so it is 360 degrees an octagon is 8 sides 720 degrees 180 times 4 = 720 degrees