Can someone please give a detailed explanation of the answer for this question? I am still unsure of the explanation given in the book. Thanks very much.
![Confused :?](./images/smilies/confused.png)
RM is absolutely correct. The area formula 0.5*base*altitude is not only for a right angled triangle, but in fact is a general triangle area formula, which can be applied on all the triangles.RM:
Area = 1/2(c-1)(b). Choice B