New ReviewFind a slice of pi. The presentation talks through the process of finding the area of sectors and segments of circles. While working examples, the installment of an extensive geometry playlist uses the process to show the formulas for...

New ReviewGo from a parallelogram to a triangle. A segment of an extensive playlist on basic geometry shows the derivation of the formula for the area of a triangle. The resource works examples that require finding a missing side or height to...

New ReviewIt really is as easy as pi. The segment of a massive geometry playlist points out that the formula for the area of a circle is a relatively simple one. Using the formula, the presenter shows examples of finding the area of circles.

New ReviewFlip the triangles up and create a parallelogram. Using the idea of transformations, the video develops the area formula for rhombi and kites. The segment of an extensive geometry playlist uses the formula to find the areas of different...

New ReviewWith a little averaging, a trapezoid becomes a parallelogram. The section of an extensive geometry playlist shows how to derive the formula for the area of a trapezoid by changing it into a parallelogram. Using the formula, the video...

New ReviewAround and in—take a different look at rectangles. A portion of a basic geometry playlist discusses the area and perimeters of rectangles. Using the formulas, the presentation works perimeter and area examples with rectangles and squares.

New ReviewSliding over a corner makes a rectangle. The resource demonstrates why the formula of the area of a parallelogram works. As part of a larger playlist on basic geometry, the video works examples dealing with parallelogram areas.

New ReviewHave students find the area of a figure in square millimeters. Then, have them measure each segment to the nearest millimeter.

New ReviewAn activity that has young geometers using geoboards to create squares and rectangles. They use a variety of strategies to decompose and create congruent shapes, as well as find the area of each. Learners must also explain their thinking...

New ReviewIf King Arthur’s meeting room is 20 m x 12 m, what would be a perfect shape and size for the table in his meeting room? This is the focus question of a worksheet that has learners using grid paper to sketch each table shape, including a...

New ReviewRefer to this pair of fortune teller examples that show the area and perimeter formulas for several polygons including a rectangle, triangle, square, and parallelogram.

New ReviewUsing tangrams, students find the area of the figures shown in a table. Then they sketch a series of figures related to the tangrams. Lastly, they use geoboard templates and square units to solve problems about the area of triangles,...

New ReviewTrapezoids can be tricky! Math scholars work together to determine the area formula for trapezoids in section two of a four-part series of lessons. The resource uses a mixture of individual and collaborative work to guide learners...

New ReviewWhat's the easiest way of finding the area of an irregular figure? Take it apart! Young mathematicians analyze strange shapes and find the areas of them using an interactive lesson. Fourth and final in a series, the two-day activity...

New ReviewMore than just a rectangle that's been pushed around, parallelograms present their own unique challenges! The third instructional activity in a four-part series of area formula lessons examines the quirky parallelogram. Geometry scholars...

New ReviewWhy give math scholars the area formula for triangles when they can discover it for themselves? The first in a series of four area-related lessons guides your class toward determining how to calculate the area of a triangle. With a...

New ReviewNeed 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,...

Pick the pattern to view the rate of change. Learners use a spreadsheet to investigate the rate of change of the areas of figures created on a geoboard to complete the final lesson of three. Pupils create and fill in a spreadsheet to...

Pick the values of the coefficients and constants. After finding different values that define the relationship between the area of geoboard figures and perimeter and interior pins, pupils work to find the coefficients that define the...

Pick the area of figures wisely. Using a geoboard, learners investigate the relationship between the area of a figure and the perimeter and interior pins in the first of a three-part series. They use the pattern to develop the equation,...

How does adding a sidewalk impact pool size? Given the size of a swimming pool, class members calculate its area. They then determine a new area if a sidewalk is added to the pool. Scholars continue to change the size of the sidewalk and...

Find formulas using direct measurements and reconstruction. Groups use diagrams of circles and measure their circumferences. With several examples, classmates determine the constant of variation, pi. Pupils continue exploring circle...

Two problems provide diagrams of sectors within circles. Pupils use the information in the diagrams to calculate the area of the sectors. One question asks for the exact area while the other asks for a rounded approximation.

Area is a two-dimensional measurement for a two-dimensional figure. The introduction of area expands on the idea of the one-dimensional measurement of length, but instead of staying one-dimensional, it goes in two directions. The video...