Classifying shapes by line and angle types

The first instance of  is under the 4th Grade Math Mission. This exercise practices classification of shapes based on a handful of geometric criteria.

Types of Problems
There are four types of problems in this exercise:


 * 1) Select types of sides: This problem has a collection of shapes and asks the student to select whether the shape has parallel sides, perpendicular sides or both.Classquad1.png
 * 2) Find classification: This problem has two groups of shapes and the student is to select the multiple choice answer that describes how the groups were selected.Classquad2.png
 * 3) Use the picture: This problem has a diagram and based on the diagram the student is asked to answer a question. The answers are in a multiple choice list on the right.Classquad3.png
 * 4) Types of triangles: This problems asks the student to classify each triangle based on its angle size, i.e., either acute, right or obtuse.Classquad4.png

Strategies
This exercise is easy to get accuracy badges because the pictures are labelled nicely and the questions are clear. Speed badges should be considered at least medium and possibly hard because there are many questions to answer on some of the problems.


 * 1) On problem type one none is not an answer. So it has either parallel OR perpendicular sides (or both).
 * 2) On the third problem type one question exists asking about a side that is parallel that can is a little subtle, but most problems of this type are fast and clear since it is multiple choice.
 * 3) You can use the corner of a piece of paper as a protractor to compare the largest angle to a right angle if angles are not nicely labelled or it is difficult to tell.