Answer: C. [tex]\text{area of }\triangle ABC=\dfrac{1}{2}\times BC\times AD[/tex]
Step-by-step explanation:
The common formula is used to find the area of a triangle is
[tex]\dfrac{1}{2}\times\text{base}\times\text{altitude}[/tex]
In the given picture , we have a triangle ABC , in which Altitude (making right angle with base) of triangle = AD with corresponding base = BC
Thus , the area of the triangle will be :
[tex]\text{area of }\triangle ABC=\dfrac{1}{2}\times BC\times AD[/tex]
Therefore , the correct options is
C. [tex]\text{area of }\triangle ABC=\dfrac{1}{2}\times BC\times AD[/tex]