Answer
The figure is a right angled triangle. The perimeter is $56$ miles and the area is $84$ sq miles.
Work Step by Step
1. Find the name of the figure:
Right angled triangle
2. Find the perimeter of the triangle
Let $P =$ the perimeter
$P = a + b + c$
$P = 7 + 24 + 25$
$P = 56$ miles
3. Find the area of the triangle
Let $A=$ area of the triangle
$A = (base \times height) \div 2$
$A = (7 \times 24) \div 2$
$A = 168 \div 2$
$A = 84$ sq miles
