To calculate the perimeter of a rectangle simply add the length and width then double your answer. In this case P = (9 + 11) x 2 = 20 x 2 = 40 yds
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16 yd
420 yards.
Perimeter is the length round the outside. A basketball court is a rectangle, so: perimeter = 2 x (length + width) = 2 x (30 yd + 40 yd) = 2 x 70 yd = 140 yd
_______10________ |_______________ | 3_______________ 3 |_______10_______| 3+3+10+10= 26 yds
Perimeter = 2*(L+W) = 2*(5+3) = 2*8 = 16 yards.