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Area and perimeter

Count unit squares to find area

Learn
Intro to area and unit squares
(Opens a modal)
Measuring rectangles with different unit squares
(Opens a modal)
Measuring area with partial unit squares
(Opens a modal)
Creating rectangles with a given area 1
(Opens a modal)
Creating rectangles with a given area 2
(Opens a modal)
Practice
Find area by counting unit squaresGet 5 of 7 questions to level up!
Find area with partial unit squaresGet 5 of 7 questions to level up!
Create rectangles with a given areaGet 5 of 7 questions to level up!

Area of rectangles

Learn
Transitioning from unit squares to area formula
(Opens a modal)
Finding missing side when given area
(Opens a modal)
Counting unit squares to find area formula
(Opens a modal)
Area of rectangles review
(Opens a modal)
Practice
Transition from unit squares to area formulaGet 5 of 7 questions to level up!
Area of rectanglesGet 5 of 7 questions to level up!
Find a missing side length when given area Get 5 of 7 questions to level up!

Perimeter

Learn
Perimeter: introduction
(Opens a modal)
Perimeter of a shape
(Opens a modal)
Find perimeter by counting unit squares
(Opens a modal)
Finding perimeter when a side length is missing
(Opens a modal)
Finding missing side length when given perimeter
(Opens a modal)
Perimeter review
(Opens a modal)
Practice
Find perimeter by counting unit squaresGet 3 of 4 questions to level up!
Find perimeter when given side lengthsGet 5 of 7 questions to level up!
Find a missing side length when given perimeterGet 5 of 7 questions to level up!

Area of parallelograms

Learn
Area of a parallelogram
(Opens a modal)
Area of parallelograms
(Opens a modal)
Finding height of a parallelogram
(Opens a modal)
Practice
Area of parallelogramsGet 3 of 4 questions to level up!
Find missing length when given area of a parallelogramGet 3 of 4 questions to level up!

Area of triangles

Learn
Area of a triangle
(Opens a modal)
Finding area of triangles
(Opens a modal)
Area of triangles
(Opens a modal)
Triangle missing side example
(Opens a modal)
Practice
Find base and height on a triangleGet 3 of 4 questions to level up!
Area of right trianglesGet 3 of 4 questions to level up!
Area of trianglesGet 5 of 7 questions to level up!
Find missing length when given area of a triangleGet 3 of 4 questions to level up!

Area of trapezoids & composite figures

Learn
Area of trapezoids
(Opens a modal)
Area of kites
(Opens a modal)
Finding area by rearranging parts
(Opens a modal)
Area of composite shapes
(Opens a modal)
Practice
Area of trapezoidsGet 3 of 4 questions to level up!
Area of composite shapesGet 3 of 4 questions to level up!
Area challengeGet 3 of 4 questions to level up!

Area and circumference of circles

Learn
Radius, diameter, circumference & π
(Opens a modal)
Labeling parts of a circle
(Opens a modal)
Radius, diameter, & circumference
(Opens a modal)
Circumference review
(Opens a modal)
Relating circumference and area
(Opens a modal)
Area of a circle
(Opens a modal)
Finding circumference of a circle when given the area
(Opens a modal)
Partial circle area and arc length
(Opens a modal)
Area of circles review
(Opens a modal)
Practice
Radius and diameterGet 5 of 7 questions to level up!
Circumference of a circleGet 3 of 4 questions to level up!
Area of a circleGet 5 of 7 questions to level up!
Area of parts of circlesGet 3 of 4 questions to level up!

About this unit

Area and perimeter help us measure the size of 2D shapes. We’ll start with the area and perimeter of rectangles. From there, we’ll tackle trickier shapes, such as triangles and circles.