Draw a square with the parties of 4 cm. Break it at first into two equal triangles, and then into four. Find in each case of the area of triangles. The 6th class

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There are two ways, it is possible through a formula of a rectangular triangle, S=a*b t.e (where and - height, and in - the basis), and it is possible just through the area of a square/2, t.e of S (square) = a^2=4^2=16 S (triangle) =162 (t. to triangles equal) = 8 S (half of a triangle) = 8/2=4 4×4=16 cm of century to 16÷2=8sm. century to 16÷4=4sm. century to
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Answer add