# Please solve q 99?

##### 2 Answers

This is called Viviani's theorem: https://en.wikipedia.org/wiki/Viviani%27s_theorem

#### Explanation:

ABC is the triangle. It's height

Remember that the area of a triangle is

Now all three triangles APC, BPC and APB have a base = 10 since all sides are equal and 10. Their total area is equal to the area of ABC

therefore

=

Therefore

Another one from Rahul's Book!

I'd say that given we're given choices, the result doesn't depend on our choice of

Let's pick