Question

A triangle has vertices on a coordinate grid at E(-8,3), F(8,3), and G(8, – 7).What is the length, in units, of EF?

Answer 1

1) To calculate it the length, let's use the distance formula for EF

where we pick the coordinate of E(-8,3) and F(8,3) and plug it into this formula derived from the Pythagorean Theorem

So,

$d_{EF}=\sqrt{(3-3)^2+(8-3)^2}=5$

2) So the length of EF is 5 units