This is a picture of Cone.
Here is a sample picture of Cylinder.
Here is a sample picture of trapezoid or Syabahmun Kharifun – Trapesium.
Here is a design of number twenty or Aisruun.
Here is a picture of triangle.
Here are some pictures of Square & Cube
Volume = P x L x T
Yes absolutely, You can learn by yourself. For example, i fixed and replaced the battery by myself a few days ago. I bought the batteries for one piece is about eight thousand rupiahs.