Of course, the main property of isosceles triangles is their two congruent sides. All isosceles triangles also have base angles that are congruent. Again, this property holds true for all isosceles triangles, no matter which direction their apex points.
In France, children start school at three years old (although it is not compulsory until six years old). A comparison between my daughter (educated in France) and her cousin (in the UK) at exactly 4 yrs 9 1/2 months old showed that a British education gives kids the tools they need to read and write much more quickly. Sarah, Apt, France
In The Netherlands, the fourth year of school is called group 6, and the pupils are 9 to 10 years old. Children start at school at the age of 4 and end school at the age of 12 or 13. In Belgium it's called 4th (study) year. The children are also around the age 9 and 10.