Does doubling mean everything doubles? Learners adjust the scale factor between two rectangles. Using the calculated measurements, pupils investigate the ratios between the lengths, perimeters, and areas of the rectangles.

In this area worksheet, students calculate the perimeter and area of given complex figures.  They determine the area of shaded regions, and find the distance between straight lines.  This one-page worksheet contains 4...

Tenth graders are provided instructions, including a video, on calculating the surface area of a prism. The one-page interactive activity contains two worked questions. Answers are included. 

In this geometry activity, students calculate the length of the sides of a given triangle. They also find the perimeter and area of the triangles given its side values. There is an answer key with this problem.

In this online interactive math skills worksheet, students solve 10 multiple choice math problems regarding geometry skills. Students may submit their answers to be scored.

In this online interactive math skills activity, students solve 10 multiple choice math problems regarding geometry skills. Students may view the correct answers.

In this online, interactive learning exercise, students solve ten SAT preparation problems in 12 minutes. The problems vary in difficulty and content.

Demonstrates the logic behind the formula for the area of a triangle. Includes several practice problems and their explanations.

To find the area of a triangle, try to make a parallelogram using a copy of the triangle.

Determine the area of a triangle.

Teat your knowledge of determing the area of a triangle using trigonometry.

An equilateral triangle is a special case of a triangle where all 3 sides have equal length and all 3 angles are equal to 60 degrees.

Use this calculator to calculate properties of a regular polygon. Enter any 1 variable plus the number of sides or the polygon name. Calculates side length, inradius, circumradius, area, and perimeter.