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The Pythagorean Theorem states that in any right triangle, the sum of the squares of the lengths of the triangle's legs is the same as the square of the length of the triangle's hypotenuse.
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The total area of the surface of a three-dimensional object.
Example: the surface area of a cube is the area of all 6 faces added together.
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Volume is the amount of 3-dimensional space an object occupies.
oxforddictionary.com
A tangram is a Chinese puzzle consisting of a square cut into five triangles, a square, and a rhomboid, which can be combined so as to form a great variety of other figures.
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image:
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Perimeter is the length of the outer border or boundry of a 2D figure.
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