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9-70.

En el diagrama de la derecha, presume que y que el punto es el punto medio de . Demuestra que .   

Quadrilateral, A, B, C, D, line segments from A, to C, from, B, to, D, intersecting at, e.

Flowchart, 6 bubbles, Bubbles 1, 2, 3 on top row, 4, & 5 on middle row, and 6, on bottom row, with arrows as follows: from 1 to 4. From 2 to 4, from 3 to 5, from 5 to 4, from 4 to 6.

Burbuja  1

Burbuja  2

Burbuja  3

Burbuja 4

Burbuja  5

Burbuja 6