1. Calculating the area of a leaning triangle

2. Calculating Area

3. Draw a rectangle (or square) around the triangle The area of this rectangle = 1 square The triangle is ½ of the rectangle so its area = ½ square Area of triangle = ½ square

4. Calculating Area What about this triangle?

5. Calculating Area Draw a rectangle around the triangle The area of this rectangle = 2 squares

6. Calculating Area The area of the triangle can be calculated by taking away the area of the 2 white triangles

7. Calculating Area The area of the first white triangle = ½ square

8. Calculating Area The area of the second white triangle is ½ of the surrounding rectangle

9. Calculating Area The area of the surrounding rectangle = 2 squares So the area of the second white triangle = 1 square

10. Calculating Area So the area of the triangle = 2 - ½ - 1 = ½ square Area of triangle = ½ square

11. Calculating Area Click here to view slide show again Click here to view slide show again