Answer:
8.49 feet
Explanation:
Characteristics of a rectangle
- A rectangle is a quadrilateral
- It has two parallel sides
- the diagonals of a rectangle bisect each other and they are equal in length
One diagonal of a rectangle divides a rectangle into two right angled triangles. Thus, the length of the rectangle can be determined using the Pythagoras theorem
The Pythagoras theorem : a² + b² = c²
where a = length = ?
b = width = 7
c = diagonal = 11
7² + a² = 11²
49² + a² = 121²
a² = 121 - 49
a² = 72
calculate the square root of 72
a = 8.49 feet