Area of Rectangular canvas is 125.875 sq.ft .
Step-by-step explanation:
Rectangular canvas dimensions
Width = 9 1/2 ft  , which means -
 = ( 18+1 ) /2
 = 9.5 ft
Length = 13 1/4 Â , which means
 = ( 52+1 ) / 4
 =  13.25 ft
Area of rectangular Canvas = width × length
 = 9.5 * 13.25
 = 125.875 sq.ft
Area of Rectangular canvas is 125.875 sq.ft .