A few more words about the EQUILATERAL TRIANGLE
1. All sides are equal, say, a
2. So, it is an Isosceles triangle thrice over i.e. when you turn it on its sides and there are three sides, each time you will end up with an isosceles triangle.
3. When you drop a perpendicular from a vertex, it bisects the opposite side
Once you understand the above simple ideas well, you can immediately write down the coordinates in the following diagrams. They have been done for you. Try to make up your own questions and find the coordinates. Have fun.
Go to Lesson 6