The space inside flat shapes — rectangles, triangles, and parallelograms.
Read this first — it covers the idea in plain language with a worked example.
Area measures the space inside a flat shape, in square units. Rectangle: length × width. Triangle: ½ × base × height. Parallelogram: base × height.
The height must be measured straight up from the base (a right angle), not along a slanted side.
Plug the base and height into the formula, then simplify.
Find the area of a triangle with base 10 cm and height 6 cm.
Tip
A trapezoid uses the average of its two parallel sides times the height.
Watch the main video, then check the second take if you want another explanation.
Try a worksheet or work through some problems before the quiz.
A couple of questions to make sure this topic stuck. Retake as many times as you want.
Area of Triangles & Quadrilaterals
What is the area of a triangle with base 10 cm and height 6 cm?
