The area of a triangle formula
A = 1/2*b*h
The base of the triangle is 8 yd
The height of the triangle is 3 yd
So plug that into the formula
A = 1/2 * 8 * 3
So what's 1/2 of 8 * 3? To find this all you have to do is multiply and then divide by 2, so
8 * 3 = 24
24 divided by 2 = 12
so your area would be 12 yd^2