### International Journal of Theoretical and Applied Mathematics

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### Modification Cross’ Theorem on Triangle with Congruence

Cross’ theorem states if any triangle ABC, on each side constructed a square and vertices of the square are connected, it will form another triangle which has an equal area to triangle ABC. In this paper we will discuss the modification Cross’ theorem on triangle, which is to construct a square outcase direction on each side triangle produced by Cross’ theorem. The purpose of this paper is to modify Cross’ theorem and give simple proof even junior or senior high school can answer. The process of proof is done in simple way, that is using a congruence approach. The result obtained are square vertices that are connected is form a trapezoid and have area 5 times the area of triangle ABC.

Triangle, Square, Congruence, Cross’ Theorem

APA Style

M. Rusdi Syawaludin, Mashadi Mashadi, Sri Gemawati. (2019). Modification Cross’ Theorem on Triangle with Congruence. International Journal of Theoretical and Applied Mathematics, 4(5), 40-44. https://doi.org/10.11648/j.ijtam.20180405.11

ACS Style

M. Rusdi Syawaludin; Mashadi Mashadi; Sri Gemawati. Modification Cross’ Theorem on Triangle with Congruence. Int. J. Theor. Appl. Math. 2019, 4(5), 40-44. doi: 10.11648/j.ijtam.20180405.11

AMA Style

M. Rusdi Syawaludin, Mashadi Mashadi, Sri Gemawati. Modification Cross’ Theorem on Triangle with Congruence. Int J Theor Appl Math. 2019;4(5):40-44. doi: 10.11648/j.ijtam.20180405.11