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Yes, it is known as a star, but it is two triangles.It is one upside down triangle on one upward triangle.
It is an Improper Fraction 7/5 should be written as 1 2/5 or one and two-fifths
first convert into a single fraction: 2 and 2/5 = 10/5 and 2/5 = 12/5 then flip upside down: 12/5 goes to 5/12, so 5/12 is the reciprocal.
Octahedron. It is two square pyramids that share a base (Imagine a pyramid from Egypt, flip it upside down, and stick that to the bottom of the original pyramid).
If you have a malleable imagination, you might say that North America and South America are similarly shaped. You might also say that Australia looks like the continental USA upside down.