The Unit Circle

Students investigate the area of squares and circles. In this geometry lesson, students calculate the area and probability of simple events. They work on a laptop using Safari.

Here is an activity that focuses on the actual construction of the square inscribed in a circle. The lesson allows for the use of dot paper or graph paper with straight edges and protractors, or dynamic geometry software programs. After...

Don't go around and around, help your class determine amounts around and in a circle with a video that connects circumference to the perimeter or the distance around an object. The resource includes 14 questions dealing with circles and...

Introduce learners to two methods to estimate the formula for the area of a circle. The first method uses sector of a circle to form a rectangle and the other uses grids to estimate the area. The problems in the 18th segment of a 28-part...

Put pi to work. The video provides the formulas for the circumference and area of circles. Using the formulas, the presenter shows how to distinguish the two using units. The discussion leads to the second formula for finding the...

Launch the pie at the right angle. An octopus floats into the unit circle and stays on the terminal side of an angle. Pupils determine the angle measurement either in radians or degrees and launches a pie at the octopus. Learners have...

Middle and high schoolers listen to a scenario about a puppy and use the scenario to develop formulas in order to find the area of a circle. In this circumference lesson, pupils understand how to find the radius, diameter, area of a...

Short, but to the point, an informative resource does the job! A quick video lesson describes how to calculate the area of a semi-circle. Learners watch the video tutorial and then practice with the included practice problems.

Need an activity that brings your class' understanding of the area formula full circle? The second installment in a two-part series involving geometric calculations further develops the young mathematician's measurement, approximation,...

Pupils demonstrate an understanding of price-per-unit mathematics. In this computation activity, learners accurately figure the unit price of grocery items. They create a chart and record the item, the price, the size and the cost per item.