Let's remember that V = lwh. If you are given two other measurements, you can multiply those two and divide V by that quantity to solve for the missing variable. Same process no matter the value:)
Answer:
,
, 
Step-by-step explanation:
The perimeter covered by the electric fence in meters is:

The area of the rectangle is:


Let differentiate the previous equation and equates to zero:

The critical point is:

By the Second Derivative Text, it is proved that critical point lead to a maximum:

The other side of the rectangle is:

The largest area than can be enclosed is:


The dimensions of the triangle are:


Answer:
15x+50=300
Step-by-step explanation:
Hypotenuse²= (4x)²+ x²=16x²+x²=17x²
Hypotenuse=√(17x²)= x√17
To find perimeter, we need to add all sides
P=x+4x+ x√17 =5x+x√17 =x(5+√17)