Properties of Shapes

{"questions":[{"content":"How many sides does a triangle have?<br>[[input-1]]","widgets":{"input-1":{"type":"input","answer":"3"}},"hints":["Trace each straight side once."],"explanation":"A triangle has 3 sides."},{"content":"Which shape has 4 equal sides and 4 right angles?<br>[[choice-2]]","widgets":{"choice-2":{"type":"choice","options":["Square","Triangle","Pentagon","Circle"],"answer":[0],"explanations":["A square has 4 equal sides and 4 right angles.","","",""]}},"hints":["Look for a quadrilateral with equal sides and square corners."],"explanation":"A square has 4 equal sides and 4 right angles."},{"content":"How many vertices does a pentagon have?<br>[[input-3]]","widgets":{"input-3":{"type":"input","answer":"5"}},"hints":["A vertex is a corner where two sides meet."],"explanation":"A pentagon has 5 vertices."},{"content":"Which shape has no straight sides?<br>[[choice-4]]","widgets":{"choice-4":{"type":"choice","options":["Circle","Rectangle","Hexagon","Triangle"],"answer":[0],"explanations":["A circle has a curved boundary and no straight sides.","","",""]}},"hints":["Think about a continuously curved boundary."],"explanation":"A circle has a curved boundary and no straight sides."}],"mix":1}