How do you use Heron's formula to find the area of a triangle with sides of lengths #12 #, #5 #, and #7 #?
The given numbers cannot be lengths of sides of a triangle. (The area is zero)
The Heron's formula says that for any triangle with sides
If we substitute given numbers we see, that:
You should have noticed, that given numbers cannot be the lengths of sides of a triangle, because