Classifying shapes by line and angle types
Classifying-shapes-by-line-and-angle-types 256
Exercise Name: Classifying shapes by line and angle types
Math Missions: 4th grade (U.S.) Math Mission, 5th grade (U.S.) Math Mission
Types of Problems: 4

The Classifying shapes by line and angle types exercise is under the 4th grade (U.S.) Math Mission and 5th grade (U.S.) 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 user to select whether the shape has parallel sides, perpendicular sides or both.

    Select types of sides

  2. Find classification: This problem has two groups of shapes and the user is to select the multiple choice answer that describes how the groups were selected.

    Find classification

  3. Use the picture: This problem has a diagram and based on the diagram the user is asked to answer a question. The answers are in a multiple choice list on the right.

    Use the picture

  4. Types of triangles: This problems asks the user to classify each triangle based on its angle size, i.e., either acute, right or obtuse.

    Types of triangles


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.

Real-life Applications

  1. Engineers and architects use angles for designs, roads, buildings and sporting facilities.
  2. Athletes use angles to enhance their performance.
  3. Carpenters use angles to make chairs, tables and sofas.
  4. Artists use their knowledge of angles to sketch portraits and paintings.
  5. The ancient Egyptians from over 4000 years ago were very good at shapes and geometry. Every time the Nile burst its banks and flooded the planes, they had to use geometry to measure their gardens and fields all over again.
  6. Architects use shapes to construct houses and skyscrapers.

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