Answer:
C 862 square units
Explanation:
the length of side of Octogan is given by the square. so length of each side is 15
Area of an Octogan
A=2(1+2)a^2
A=2(1+2)15^2 = 1086.4 square units
A= l X w
A= 15 X 15 = 225 square units
1086.4 - 225 = 861.4 square units