You would multiply 2 1/2 and 3 3/4, which would give you 9.375 or as a mixed number 9 7/8
R'S' is equal in length to RS.
length doesnt change, it was just rotated.
Answer:
C. 647 square units
Step-by-step explanation:
To find the shaded area, subtract the area of the unshaded square from the area of the octagon.
<u>Area of the octagon</u>

where:
- n = number of sides
- l = length of one side
- a = apothem
Given:
Substitute the given values into the formula and solve for A:



<u>Area of the square</u>

<u>Area of the shaded region</u>
= area of the octagon - area of the square
= 815.88 - 169
= 646.88
= 647 square units (nearest square unit)
The perimeter of a square is the sum of all its sides' lengths
That means: perimeter =4*(7m+1)/3