A obtuse triangle requires at least a few acute triangle components

That is: How does a obtuse triangle divide to make it consist of a finite number of acute triangle and make these acute triangle the fewest?
Answer: Divided into 7 acute triangle;.
methods: A convex Pentagon was made by using an obtuse angle for one side of the middle part of the edge;

Take Pentagon inside a point, respectively connected to five vertices, into five acute triangle, plus the remaining two, is 7.

That is: In the center of the original triangle to take a point outward radiation 5 ray lines, the formation of star type, a cross-origin triangle obtuse point, the other one in the obtuse angle on both sides, the remaining two in the obtuse angle to the edge, and then connect the obtuse angle to the edge of the intersection of two points to an obtuse edge, so that the original

A obtuse triangle requires at least a few acute triangle components