Question

For this item, any non-integer answer should be entered as a decimal, rounded to the hundredths place.

Triangle ABC has coordinates A(-4,1), B(0,-2),and C(4,1).

The perimeter of ∆ABC is ___ units.

Answer 1

Answer: 18 units

Explanation:

Answer 2

9514 1404 393

Answer:

18 units

Explanation:

The distance formula is used to find the distance between two points:

d = √((x2 -x1)² +(y2 -y1)²)

For AB, the distance is ...

d = √((0 -(-4))² +(-2 -1)²) = √(16 +9) = √25 = 5

The distances between the other pairs of points can be found the same way. We have elected to let a spreadsheet do the math. It tells us the perimeter of triangle ABC is 18 units.