Answer:
a=12 and b=6
Explanation:
SORRY IF CONFUSING
The formula for the area of a triangle is 1/2 times base times height.
So for part a it would be 6x4x(1/2)
Which equals 12
For part b the height is 3 and the base is 4
The equation would be 4x3(1/2)
Another way to solve part be is (helpful for problems where you don't know the base of height)
Make a square around the triangle
The dimensions of the square are 3 by 7
The square makes two triangles to solve the area of
Triangle 1 is 3x3(1/2)=21/2
Triangle 2 is 7x3(1/2)=9/2
Now you subtract the area of the two triangles from the square to get the area of the original triangle
21-(21/2)-(9/2)
Which equals 6