Area of Triangle

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“The triangle ABC is divided into 2 right triangles I and II. ABC is seen to be equal to 1/2 of the rectangle ABNO.” -Foster, 1921

Keywords

rectangle, right triangles, equal triangles, triangle area, half base times height

Galleries

Miscellaneous Triangles

Source

Ellsworth D. Foster ed. The American Educator (vol. 1) (Chicago, IL: Ralph Durham Company, 1921)

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