Class 8 Mathematics | Area and Volume

Mathematics, Class 8

Area and Volume

Triangles and quadrilaterals · Circles and π · Composite shapes

What We Will Be Able to Do

📐

Find the area of four kinds of triangle

🔷

Find the area of parallelograms, rhombuses, trapeziums and general quadrilaterals

⭕

Find the circumference and the area of a circle

🧩

Break a composite shape into pieces and solve it

Where the formula comes from

From a Rectangle to a Triangle

BUILD

Take a rectangle of length l and breadth b, whose area is \( l \times b \).

CUT

Fold along the diagonal and cut. The two pieces match exactly.

CONCLUDE

One triangle is half the rectangle, so \( A = \frac{1}{2} \times b \times p \).

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Presenter notes: Today's lesson is about measuring the space that flat shapes cover. Open by pointing at the classroom door or an exercise book and asking the class how much space it takes up.

Area and Volume Presentation

What We Will Be Able to Do

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