The document defines perimeter as the length of the boundary of a closed plane figure and provides formulas to calculate the perimeter of rectangles, squares and triangles. It defines area as the space within the boundary of a figure and provides formulas to calculate the area of parallelograms, triangles and trapeziums, including using half the base times the height.

2. Perimeter and Area By Deepak Kumar

3. Perimeter The perimeter of a closed plane figure is the length of its boundary. 15cm 10cm 8cm 7cm 8cm Perimeter = 15 + 8 + 10 + 8 + 7 = 48cm

4. Perimeter Rectangle Square Triangles P = 8 + 5 + 8 + 5 P = l + b + l + b = 2(l + b) L= 8cm P = 6 + 6 + 6 + 6 P = l + l + l + l = 4l or 4s L=6cm b=4cm a b c P = a + b + c

5. Area Area is the space within the boundary of a figure.

6. Area of parallelogram Area of parallelogram = base x height base height

7. Area of a triangle Area = ½ x base x height b b h h h b

8. Area of trapezium Area of trapezium ABCD = area of Δ ABC + area of Δ ACD = (½ x BC x AH) + (½ x AD x CK) = ½ x AH x (BC + AD) = ½ x height x sum of parallel sides A D C H B K

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