00:01
Welcome to numerate in the current problem it's given ad is equals to that is this length is 9.
00:12
Ac is equals to 12.
00:18
That is this length is 12 and with the given information we have to find ab.
00:27
A, okay? so from this given information of ad and ac we have to find.
00:37
Eb the whole length so if you see this small triangle is a right angle triangle so we can find cd correct and once we can find cd cd also represents a part of the smaller triangle and then from some use of similar triangles ratios we will find the value of bd this part and then if we add bd and ed we will find ab.
01:06
So let's begin with h square that is hypoteny square equals to p square plus b square okay for triangle ac d or a d c a d c a d so h is nothing but 12 square is equal to perpendicular is cd square plus b is ad which is nine square therefore cd square is equal cd square 12 square minus 9 square.
01:38
Instead of going to split it, what i will do, i will put a square minus b formula that is a plus b into a minus b, correct? so we will get 12 plus 9 21 into 12 minus 9.
01:55
So, what is this? 7 into 3 into 3, which is cd square...