Geometry
posted by Will .
Picture given with problem: media.glynlyon(dot)com/g_geo_2012/12/img_geou12abc_8.gif
If AC = 20, AE = 25, and AB = 5, what is the length of AD?
Please explain how this is found, I've got a few problems like this and have no idea how to do it.

You need to review properties of secants and circles. In your diagram,
AB*AC = AD*AE
5*20 = AD*25
AD = 4
Respond to this Question
Similar Questions

math
I still don't get it. I asked someone and they said that the answer was 111. ok, i got it but i still don't understand how to do it since i still have many more problems. could someone please thorougly explain to me in steps how to … 
Organic Chemistry
Determine bond length and bond strength? The picture of the problem is shown here: oi52[insert dot]tinypic[insert dot]com/jfgnb6[insert dot]jpg I got the following: I think that the strongest bond is the triple bond (A). I think that 
math
((media.apexlearning[dot]com/Images/200706/18/c57fe1911eb340c99b92b10afad323f5.gif)) (above is the graph replace dot with .) The lines graphed below are perpendicular. The slope of the red line is 4. What is the slope of the green … 
Chemistry
Hi everyone, I really need help with this problem. What is the reactant, products, and what compounds is it? 
math
i.imgur[dot]com/hE0sWBt[dot]gif prove. [steve please take another look at this.] 
math
i.imgur[dot]com/hE0sWBt[dot]gif prove. [steve please take another look at this.] 
Algebra
A school is keeping track of the number of tickets remaining for its endofyear festival. Below is the number of sales for the first, second, third, and fourth weeks of the month leading up to the festival. Which graph could represent … 
Algebra
A candy store keeps track of its sales during the month of October. Below is the number of sales for the first, second, third, and fourth weeks of the month. Which graph could represent the data shown below? 
Math
We have a picture frame with width being 3 1/4 inches and length unknown. We need to fit picture with width of 4 cm and length 4.6 cm into frame. What is the scale factor for enlargement? 
Science (Biology)
Use your knowledge of photosynthesis to explain what is happening in the following graphs. 67(dot)media(dot)tumblr(dot)com /d99a0dd856c87dfc21b9314f89019994/tumblr_o7ltp1unLS1tt1il6o1_1280.jpg