Area of a non-right angled triangle with information missing

[tinky]

The area of the triangle in the attachment has to be found.

It is not stated in the question what kind of a triangle it is nor are there any angles given.

I believe that there is information that has been left out of the diagram to solve this question (This is a question in a maths workbook by Schofields and Sims mental arithmathics 4).


Thanks in advance for the help.

Tinky

 

[vela]

The diagram has all the information needed. How do you find the area of a triangle?

 

[tinky]

No idea, i would've done it the easiest way which is to find the area of a rectangle and take away the areas of the two smaller triangles around the original triangle.

 

[vela]

Did you try looking up how to find the area of a triangle in your textbook?

This page tells you how to solve the problem, though it doesn't really explain why the formula works.

http://www.cimt.plymouth.ac.uk/projects/mepres/book7/bk7i9/bk7_9i5.htm

 

[tinky]

Thanks for the link. For some reason I didn't think 0.5xbxh = area would work with an oblique triangle..really silly of me