Let's Study Amazing Mathematics....!! ^^

Though that I'm an university student of mathematics, but in my lesson I get english lesson there,and my English Lecturer's name is Mr.Marsigit.
English is very important for us,so we get this in all class.

For our last assigment of english lesson,Mr.Marsigit command us to look for a partner,and my partner's name is Lucia Martika Yundarwiti,she usually called yuyun.He command us to find out some plane and we have to compose our idea to exlpain that plane.

I explain yuyun about square.For first step I explain about the definition of the square.Square have four congruent sides and four right angles.The square is a highly symmetric object.Each angle is 90 degree.Second, i explain to Yuyun to calculate the surface area of this plane.For calculate the surface area we use the formula sxs or A=s^2.I give an example to Yuyun,there are a square which has 5cm side,so the surface area of this square is 5^2=25cm^2.
if we slice a square pass its plane diagonal,we get two right triangle there.

Then,Yuyun explain to me about a rectangle.She explain that a rectangle is a quadrilateral where all four of its angles are right angles.It follows that a rectangle has two pairs of parallel sides; that is, a rectangle is a parallelogram.It is also a special case of a trapezoid or trapezium. A rectangle with vertices ABCD would be denoted as ABCD. The dual polygon of a rectangle is a rhombus. The three-dimensional counterpart of a rectangle is a cuboid, also called a rectangular parallelepiped.
A perfect rectangle may refer to the golden rectangle, or to a rectangle partitioned into similar polygons all of different sizes.

It's a happiness thing to study together with Yuyun,we can share our problem,so we understand about this solution of mathematics problem.It's real that Mathematics is amazing.