(1)

Step 1:

The height of the triangle is $\"\"$ .

The width of the triangle is $\"\"$ .

The width of the triangle represents the base of the traingle.

The area of the triangular yield sign is $\"\"$ .

Substitute $\"\"$ and $\"\"$ .

$\"\"$

$\"\"$ .

The area of triangular yield sign is $\"\"$

Solution:

The area of triangular yield sign is $\"\"$ .