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Covering And Surrounding

Practice identifying types of triangles: obtuse, right, isoleses and equilateral. Learn how to find the area of a triange and use the Pythagoran Theorem to find the length of the hypotenuse.

Identify different polygons. Learn to find the perimeter of a rectangle and the area of a rectangle.

Circle: find the circumference and the area.

Review what you've learned about geometry


Area and Perimeter



ParentsCovering and Surrounding

Concept with Explanation
Selected Homework from ACE

In Covering and Surrounding student work with investigations leads them to:

  • Understand area and relate area to covering a figure;

  • Understand perimeter and relate perimeter to surrounding a figure;

  • Develop strategies for finding areas and perimeters of rectangular shapes and non-rectangular shapes;

  • Discover relationships between perimeter and area. including that each can vary while the other stays fixed;

  • Understand how the areas of simple geometric figures relate to each other (e.g. the area of a parallelogram is twice the area of a triangle with the same base and height);

  • Develop formulas and procedures-stated in words and/or symbols-for finding areas and perimeters of rectangles, parallelograms, triangles, and circles;

  • Develop techniques for estimating the area and perimeter of an irregular figure; and

  • Recognize situations in which measuring perimeter or area will help answer practical questions.