1. Areas by "Triangle Boxing"
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2. We can sometimes find the area of some awkward shapes by boxing them inside bigger shapes.
It helps if everything is drawn on a grid 3 3 3 2 6 4 18 6 4 18 6 2 3 6
x 6
= 36 36
– 18
= 18 3 3 6
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3. Practice
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4. Calculate the area of the following shape:1 3 8 3 1
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5. Calculate the area of the following shape:3 18 5 4
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6. Calculate the area of the following shape:9 12 5 4
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7. Calculate the area of the following shape:
1.5 2 15 2
1.5
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8. Calculate the area of the following shape:12 17 5 6
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9. Calculate the area of the following shape:1
2.5 11
2.5 1
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10. Calculate the area of the following shape:3 2 6 19 1 6
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11. Calculate the area of the following shape:
1.5 1 8
1.5
1.5 1
1.5
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12. Calculate the area of the following shape:3
7.5 6 21 3
13.5
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13. Exam Question
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14. The vertices of a triangle ABC have coordinates A (-1,1), B (1,-4) and C (3,2).
Calculate the area of ABC. C 2 A 11 5 6 B
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