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

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Presentation transcript:

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

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

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

Area of parallelogram Area of parallelogram = base x height height

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

Area of trapezium Area of trapezium ABCD = area of ΔABC + area of ΔACD K A B C H Area of trapezium ABCD = area of ΔABC + area of ΔACD = (½ x BC x AH) + (½ x AD x CK) = ½ x AH x (BC + AD) = ½ x height x sum of parallel sides

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