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Discovering the Area Formula for Circles
Students discover the area formula for circles from their knowledge of parallelograms.
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Discovering the Formula for the Area of a Triangle
Most high schoolers are very familiar with the area of the triangle being equal to 1/2 base times the height. Here, they will develop and test their formula for the area of a triangle when given two adjacent sides and the included angle....
9th - 11th Math CCSS: Designed
New Review An Area Formula for Triangles
Use a triangle area formula that works when the height is unknown. The eighth installment in a 16-part series on trigonometry revisits the trigonometric triangle area formula that previously was shown to work with the acute triangles....
11th - 12th Math CCSS: Designed
New Review Area and Circumference of Circles
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...
9 mins 8th - 10th Math CCSS: Adaptable
New Review Surface Area and Volume
Partners use materials to wrap three-dimensional objects to determine the formula for surface area. The groups use an orange to calculate the amount of peel it takes to completely cover the fruit. Using manipulatives, individuals then...
9th - 11th Math CCSS: Adaptable
Areas of Geometric Shapes with the Same Perimeter
A triangle, square, hexagon, and circle all have a perimeter of one unit. Eighth graders must attempt to find the area of each and arrange them in order from least to greatest areas. A terrific task for applying four different area...
7th - 9th Math CCSS: Designed
Circumference and Areas of Circles
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...
7th - 12th Math CCSS: Adaptable
Use Area of a Circle to Solve for Circumference
Common circumference problems have learners plug in the radius to solve. Not here! Encourage your learners to work backward through a problem when provided with the area to find the circumference with this last video of a series about...
4 mins 6th - 9th Math CCSS: Designed