Compute area, surface area, and volume — and apply them to real measurement problems.
Quick read-throughs in plain language — then hit the videos below.
Rectangle: length × width. Triangle: ½ × base × height. The height must be straight up, not slanted.
Parallelogram: base × height. Trapezoid: average the two parallel sides, then × height.
Try it
Triangle with base 10 cm and height 6 cm — what's the area?
By the end of this unit, you should be able to:
Each video covers one topic from this unit — read the short blurb below to find the right one.
Split a weird shape into rectangles and triangles.
Watch on YouTubeStep-by-step practice with combined shapes.
Watch on YouTubeAnother walk-through of finding surface area from nets.
Watch on YouTubeMultiply length × width × height to find volume.
Watch on YouTubeApply area, surface area, and volume to real situations.
Watch on YouTubeQuick review of the key formulas from this unit.
Watch on YouTubeFind how much water a tank holds using volume.
Watch on YouTubeAdam's curated problem sets — preview here or open in Google Drive.
Hand-picked links from Khan Academy and trusted worksheet libraries.
A few quick questions to make sure the big ideas stuck. Retake as many times as you want.
Unit 5: Geometry — Area & Volume
What is the area of a triangle with base 10 cm and height 6 cm?
