Perimeter Check

{"questions":[{"content":"Find the perimeter of a rectangle measuring 8 cm by 4 cm.<br>[[input-1]]","widgets":{"input-1":{"type":"input","answer":"24"}},"hints":["Double the sum of length and width."],"explanation":"2 × (8 + 4) = 24 cm."},{"content":"Find the perimeter of a square with 9 cm sides.<br>[[input-2]]","widgets":{"input-2":{"type":"input","answer":"36"}},"hints":["Multiply one side by 4."],"explanation":"4 × 9 = 36 cm."},{"content":"A triangle has side lengths 6 m, 7 m, and 8 m. Find its perimeter.<br>[[input-3]]","widgets":{"input-3":{"type":"input","answer":"21"}},"hints":["Add all side lengths."],"explanation":"6 + 7 + 8 = 21 m."},{"content":"A pentagon has five sides of 3 cm each. Find its perimeter.<br>[[input-4]]","widgets":{"input-4":{"type":"input","answer":"15"}},"hints":["Use five equal groups of 3."],"explanation":"5 × 3 = 15 cm."},{"content":"Sam walks once around a 10 m by 5 m garden. How far does Sam walk?<br>[[choice-5]]","widgets":{"choice-5":{"type":"choice","options":["30 m","50 m","15 m","20 m"],"answer":[0],"explanations":["10 + 5 + 10 + 5 = 30 m.","","",""]}},"hints":["Find the rectangle’s perimeter."],"explanation":"10 + 5 + 10 + 5 = 30 m."},{"content":"Which information is needed to find a shape’s perimeter?<br>[[choice-6]]","widgets":{"choice-6":{"type":"choice","options":["The lengths around its boundary","The colour inside it","Its position on a page","The number of shapes nearby"],"answer":[0],"explanations":["Boundary lengths determine perimeter.","","",""]}},"hints":["Perimeter measures around the outside."],"explanation":"Boundary lengths determine perimeter."},{"content":"A rectangle has perimeter 26 cm and length 8 cm. What is its width?<br>[[input-7]]","widgets":{"input-7":{"type":"input","answer":"5"}},"hints":["Remove both 8 cm sides, then split what remains."],"explanation":"26 − 16 = 10, and 10 ÷ 2 = 5 cm."},{"content":"A 4 cm square and a 5 cm square are compared. How much greater is the larger perimeter?<br>[[choice-8]]","widgets":{"choice-8":{"type":"choice","options":["4 cm","1 cm","9 cm","20 cm"],"answer":[0],"explanations":["The perimeters are 16 cm and 20 cm, a difference of 4 cm.","","",""]}},"hints":["Find both perimeters first."],"explanation":"The perimeters are 16 cm and 20 cm, a difference of 4 cm."}],"mix":1}