(2) Connect the vertex and the intersection of two waist vertical lines, and divide the graph into two triangles. The area of the left triangle is waist * height /2= area, that is, 10*a/2= area, and the area of the right triangle is 10*b/2.
The total area is the sum of the areas of two triangles (10 * a/2)+(10 * b/2) = 34, so a+b=6.8.
(3) Conclusion: The sum of the distances from any point on the bottom of the triangle to the two waists is equal to the height of any waist.