## dumbsearch2 one year ago Geometry theorem problem:

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1. dumbsearch2

2. anonymous

It looks like this is asking you to prove that segments AC and BC are perpendicular using the slope formula. $m=\frac{ y_2-y_1 }{ x_2-x_1 }$

3. dumbsearch2

what would y and x be? @peachpi

4. anonymous

you'd use the coordinates of the points. For example, A is (-c, 0) so for point A, x = -c and y = 0.

5. anonymous

so to find the slope of AC, the points to plug into the formula would be (-c, 0) and (a, b)

6. dumbsearch2

(b)/(a+c) is not in any of the answer choices @peachpi

7. dumbsearch2

I used that formula but I don't get the answer.

8. anonymous

are you sure, b/(a + c) looks like it's part of 3 of the answer choices

9. anonymous

so you have the slope of AC. Find the slope of BC

10. dumbsearch2

does it equal = -1 or = 1?

11. anonymous

slopes of perpendicular lines multiply to -1

12. anonymous

they're opposite reciprocals