Question 1076069
The height is 4+y, and the width is 9-2y, so:
2(4+y)+2(9-2y)=20
8+2y+18-4y=20
y=3
The rectangle measures 7 cm by 3 cm, so its area is 21 cm.². &#9786;&#9786;&#9786;&#9786;