(ANSWER)
AREA OF WALK = 444 SQUARE FEE
(EXPLANATION)
FIRST, CALCULATE THE AREA OF THE RECTANGULAR YARD.
♥ A = L × W where A equals area, L equals length, and W equals width.
ACCORDING TO YOUR STATED PROBLEM:
♥ A = 1519 square feet. <––– Area of Rectangular yard.
♥ NOW, ACCORDING TO YOUR STATED PROBLEM THERE IS A WALK THAT IS 3 FEET WIDE GOING ALL THE WAY ALONG THE FENCE (INSIDE).
♥ THEREFORE, YOU HAVE SIX FEET TO SUBTRACT FROM EACH OF THE VALUES ABOVE (31) AND (49).
WHY?
THREE FEET ON EACH SIDE, CORRECT?
A = L × W
A = 25 × 43
A = 1075 square feet <––––Area of new rectangle formed by allowing for three foot walk.
♥ NOW, SUBTRACT THE AREA OF THE NEW RECTANGLE FORMED FROM THE AREA OF THE ORIGINAL AREA. DOING SO, WILL GIVE YOU THE AREA OF THE WALK, CORRECT?
♥ ORIGINAL AREA = 1519 square feet
♥ NEW AREA = 1075 square feet
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