By considering a right angled triangle as half a rectangle the students are guided through deriving the formula for any triangle. The emphasis is placed on recognizing the perpendicular height for isosceles and scalene triangles with different orientations.
Differentiated Learning Objectives
- All students should be able to calculate the area of a right-angled triangle as half of a rectangle.
- Most students should be able to derive the formula for the area of a triangle and use it.
- Some students should be able to calculate the area of a compound shape involving rectangles and triangles.