TEACHING MATERIAL FOR THEOREM OF THREE SQUARES

摘要

PROBLEM TO BE SOLVED: To obtain the teaching material for the theorem of three squares which is extremely effective in understanding the theorem of three squares in a teaching material for mathematical figure learning. ;SOLUTION: This material comprises a disk body A having a right-angled triangular window 1, a large square window 2, an intermediate square window 3, and a small square window 4, a 1st plate material P₁ where a right-angled triangular 1st display part D₁ which is sectioned while crossing the intermediate square window 3 by folding the large square window 2 back along the oblique side 1a of the right-angled square window 1 is recorded, a 2nd plate material P₂ where a 2nd display part D₂ as a small right-angled triangular part is recorded, a 3rd plate material P₃ where a quadrangular 3rd display part D₃ is recorded, a 4th plate material P₃ where a right-angled triangular 4th display part D₄ sectioned with a line parallel to the oblique side 1a of the right-angled triangular window 1 in the small square window 4 is recorded, a 5th plate material P₅ where a trapezoidal 5th display part D₅ is recorded, and a 1st movement guide G₁ to a 5th movement guide G₅ constituting the square of the large square window 2 by moving the 1st plate material P₁ to 5th plate material P₅ to the large square window 2.;COPYRIGHT: (C)1999,JPO