Perimeter

{"questions":[{"content":"A rectangle is 5 cm long and 3 cm wide. What is its perimeter in centimetres?<br>[[input-1]]","widgets":{"input-1":{"type":"input","answer":"16"}},"hints":["Add 5 + 3 + 5 + 3."],"explanation":"The perimeter is 16 cm."},{"content":"A square has side length 6 m. What is its perimeter in metres?<br>[[input-2]]","widgets":{"input-2":{"type":"input","answer":"24"}},"hints":["A square has four equal sides."],"explanation":"4 × 6 = 24 m."},{"content":"A triangle has sides 4 cm, 5 cm, and 7 cm. What is its perimeter?<br>[[input-3]]","widgets":{"input-3":{"type":"input","answer":"16"}},"hints":["Add all three sides."],"explanation":"4 + 5 + 7 = 16 cm."},{"content":"Which calculation finds the perimeter of a 9-by-2 rectangle?<br>[[choice-4]]","widgets":{"choice-4":{"type":"choice","options":["9 + 2 + 9 + 2","9 × 2","9 + 2","9 − 2"],"answer":[0],"explanations":["The two lengths and two widths must all be added.","","",""]}},"hints":["Include all four sides."],"explanation":"The two lengths and two widths must all be added."}],"mix":1}