how do you do this? could you also explain

Answer:
B. 12
Step-by-step explanation:
1. The area of a triangle is equal to [tex]\frac{bh}{2}[/tex].
2. Since we're given the base, line mn, as 3 and the height as 8, let's apply the formula that was aforementioned.
Therefore, the answer is B. 12.
Answer:
The area of the triangle is B. 12
Step-by-step explanation:
Area of a triangle is (base × height) ÷ 2 = [tex]\frac{bh}{2}[/tex]
So..
[tex]\frac{bh}{2}[/tex]
= [tex]\frac{(3)(8) }{2}[/tex]
= [tex]\frac{24}{2}[/tex]
= 12