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Area of a Triangle

Geometry and Measures Area of a Triangle

🎬 Video Tutorial

(0:01) Area of a Triangle Formula: The area of a triangle is half of the Base (B) multiplied by the height (h): $ A = \frac{1}{2} \times Bh$.
(0:45) Choosing the Base and Height: To calculate the area of triangles, choose any side of the triangle as the base, and the height is the perpendicular distance from this base to the opposite vertex.
(1:57) Example on Right-Angled Triangles: In right-angled triangles, the two shorter sides (legs) can be used as the base and height because they are perpendicular to each other.
(2:37) How to Find the Height of a Triangle: If the area and base are known, rearrange the formula to find the height of the triangle.

📂 Revision Cards

Diagram explaining the area of triangles formula 1/2 × b × h, examples of perpendicular height, and notes emphasising any side as base. — 1) Area of Triangles Formula

Illustration of finding the area of a triangle with a base of 6 cm and height of 5 cm using the formula 1/2 × base × height, resulting in 15 cm². — 2) Regular Triangles Example

The area question of a right-angled triangle with a base of 5 cm and height of 12 cm. Calculations demonstrate the area formula, yielding 30 cm². — 3) Right-angled Triangles Example

How to calculate the height of a triangle using its area, with given dimensions and a worked-out formula solution. — 4) Finding the Height from the Area

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