Lindsey constructs a triangle with one side 3 inches long and another side 9 inches long. Which is not a possible length for the third side?

12

Step-by-step explanation:

The sum of any two sides of a triangle must be greater than the third side.

false

step-by-step explanation:

i looked it up

pentagon

step-by-step explanation:

the coordinates   a(5, -2), b(3,-1),c(-4,-4) d(-3,8) and e(-1,4) forms the vertices of the polygon when they are connected in order.

in order to classify that which polygon is it with the given coordinates, first count the number of vertices and then count the number of sides it can make with these vertices.

since, the given coordinates have five vertices, therefore, it will make five sides. moreover, pentagon is regular in nature therefore it will be convex.

now, a polygon with five sides is known as pentagon, therefore, the given polygon is the pentagon.