OpenStudy (anonymous):

Calculate the area of triangle CDE with altitude EF, given C (3, −2), D (−1, 2), E (2, 3), and F (0, 1). 4 square units 6.2 square units 8 square units 8.7 square units

3 years ago
OpenStudy (anonymous):

@phi @emilycs713 @israr000

3 years ago
OpenStudy (phi):

It might be helpful to plot the points to see what is what. But to finish the problem you need to know the formula to find the area of a triangle do you know it ?

3 years ago
OpenStudy (anonymous):

I got 8 as my answer! @phi

3 years ago
OpenStudy (anonymous):

distance formula right?

3 years ago
OpenStudy (phi):

yes, you use the distance formula twice.

3 years ago
OpenStudy (anonymous):

Alright, I ended up with 8 as my final answer. Do you know if it is right? I would show my work, but it's on paper, and very hard to put up here. :/

3 years ago
OpenStudy (phi):

just say what segments you found the length of: base and height and the lengths you found

3 years ago
OpenStudy (anonymous):

To calculate the area, you need to multiply one side by an adjacent side. To find the side length, use the distance formula: √(x2-x1)²+(y2-y1)². This will give you the side length, so then you can multiply the two. It helps to draw it out so you know that the sets of coordinates form lines that are adjacent.

3 years ago