15 points + brainliest

B

Step-by-step explanation:

The second one is correct. If you square 1.5 and 2 and 2.5 and use pythagorean theorem, then you will get the two sides to equal each other, this concluding it to be true

54

step-by-step explanation:

6x9

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.