The four triangles at right are placed in a bag. If you reach into the bag without looking and pull out one triangle at random, what is the probability that:  

1. the triangle is scalene?

   Hint (a):

   Remember that a scalene triangle has no sides of equal length.

2. the triangle is isosceles?

   Hint (b):

   Remember that an isosceles triangle has two sides of equal length.

3. at least one side of the triangle is $6$ cm?

   Hint (c):

   For part (c) use the formula: $\frac{\text{number of triangles that have at least one side of 6 cm}}{\text{total number of triangles}}$

   Answer (c):

   $\text{P}\text{(side of triangle is 6 cm)}=\frac{2}{4}=\frac{1}{2}$