Triangle ABC is a right angled at A. AD is perpendicular to BC,AB=5cm,BC=13cm andAC=12cm. Find the area of triangle ABC.also find the length of AD

Answer 1

You will have 3 similar right-angled triangles.

I will list them with matching vertices
ABC
DBA
DAC

You can now form any ratio
e.g. BC/AB = BA/DB = AC/DA
plug in your given values and you can find all sides