# Area of a Triangle

- Author:
- Thomas, Adam Antonio

- Topic:
- Area

**Establish the formulas for areas of rectangles, triangles and parallelograms, and use these in problem solving**(ACMMG159 - Scootle) -

*building on the understanding of the area of rectangles to develop formulas for the area of triangles - establishing that the area of a triangle is half the area of an appropriate rectangle - using area formulas for rectangles and triangles to solve problems involving areas of surface*Use the sliders (red dots) to change the size of the triangle/rectangle. Use the checkboxes (top left-hand corner) to show/hide the area of the rectangle and triangle. Use formula:

**B x H**(base x height) for surface area of a rectangle. Use formula:

**1/2 B x H**(half [0.5] x base x height) for surface area of a triangle.

*Can you see the relationship between the area of a triangle and a rectangle? (50-100 words)***F**

*a) B = 6, H = 4 Rectangle Area = Triangle Area = b) B = 12, H = 10 Rectangle Area = Triangle Area = c) B = 20, H = 50 Rectangle Area = Triangle Area =*

**ind the area of both rectangle and triangles for:***a) b) c) d) e)*

**Use the interactive platform to make and solve 5 of your own problems (you can be creative with your numbers).**