Please help with these three question. these are grade 10 math

save of unit test (1).asdw aad - Saved to this PC Search References Mailings Review View Help Aa~ Po AaBbCI AaBbCr AaBbC( 1 No Spac.. Heading 1 He D- A 1 Normal Styles Paragraph isosceles 10)A triangle has vertices at L(1,2), M(-3,-1) and N(0,5). Determine if it is an triangle. (4 marks)E Paragraph Styles 12) The city is trying to open a road that connects a cabin in the woods to a roadside. The roadside connects 2 parks. The cabin site is located at (8,6) on the map and the parks are at point A (-2,10) and point B (5, 4). Find the route that minimizes the cost and the number of trees that have to be cut down (Hint: Find the shortest distance between the cabin and the roadside) (11 marks)1 1)Prove that the triangle with vertices A(-5,3), B(4,0) and C(6,6) is a right- angled triangle. (4 marks) Using this formula for A, B x1+x2 yl+y2 (United States)