What is the perimeter of the triangle shown on the coordinate plane, to the nearest tenth of a unit? 14.6 units 15.5 units 21.0 units 21.6 units

see the attached figure to better understand the problem

we know that the distance between two points is equal to

Let

Step 1

Find the distance AB

substitute in the formula

Step 2

Find the distance BC

substitute in the formula

Step 3

Find the distance AC

substitute in the formula

Step 4

Find the perimeter of the triangle

we know that

the perimeter of the triangle is the sum of the length sides of the triangle

substitute the values

therefore

the answer is

the perimeter of the triangle is