Areas of Flags 2.

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Areas of Flags 2

Starter This is the Flag of Iceland. The ratio of height to base is 3:4. The red area is 20cm2 more than the white area. Calculate the area of each colour. 6cm 11cm 6cm 15cm

Areas of Flags 2 Learning Objectives All will be able to calculate the areas of Triangles and Parallelograms in the context of flags (Level 5/6) Most will be able to involve additional information in the questions (Level 6) Some will be able to include ratio and more advanced problem-solving skills in the questions (Level 6/7)

Areas of Flags 2 How could we calculate the area of this Triangle? 5cm

Base x Perpendicular Height Areas of Flags 2 Area of a Triangle Base x Perpendicular Height 2 11m 9cm 8cm 5m 3cm B x H 2 3 x 8 2 B x H 2 5 x 11 2 = = 12cm2 = = 27.5m2

Areas of Flags 2 How could we calculate the area of this Parallelogram? 5cm 4cm 9cm

Base x Perpendicular Height Areas of Flags 2 Area of a Parallelogram Base x Perpendicular Height 2m 7m 6cm 7cm 5m 13cm B x H = 13 x 6 = 78cm2 B x H = 2 x 5 = 10m2

Areas of Flags 2 This is the flag of Djibouti. The red star takes up 5% of the area of the white triangle. The white triangle’s tip is in the centre of the flag. Calculate the area of each part of the flag. 12cm 20cm

Plenary

Summary We have seen how to calculate the areas of Triangles and Parallelograms We have again practised this in the context of flags!