The coordinates a(2, 1), b(7, 1), c(2, 4) form what type of polygon? a. an acute triangle b. an obtuse triangle c. a right triangle d. an isosceles triangle

 The correct option is (C) a right triangle.

Step-by-step explanation:  The given co-ordinates of a polygon are A(2, 1), B(7, 1), C(2, 4).

We are to select the correct type of the polygon.

Since we have the co-ordinates of the three points A, B and C, so the polygon will surely be a triangle.

Now, the lengths of the three sides AB, BC and CA of ΔABC can be calculated using distance formula as follows :

We have

This implies that

which is the Pythagorean triple. Hence, triangle ABC is a right-angled triangle.

Thus, (C) is the correct option.

you probably already have the answer but anyways it's b. 15.0

step-by-step explanation:

9 x 8 divided by (5-3)=36