Area and Perimeter of a Rectangle

Drag point C to change the dimensions of the Rectangle.
1) If the width of a rectangle is 5 and its lengh is twice the width, what is the perimeter of the rectangle? 2) Create a rectangle that has an area of 80. What is the length and width of the rectangle? 3) Zack is buying wood to build a fence around his backyard. The backyard is 35ft long and 50ft wide. What is the area of Zack's backyard? A- 85 sq ft B- 170 sq ft C- 3,500 sq ft D- 1,750 sq ft