It seems like the image contains several geometric shapes with names or properties related to them. Based on your description, here are the shapes:

1. Decagon - A polygon with 10 sides.
2. Quadrilateral - A four-sided polygon.
3. Obtuse Angle - A triangle with one angle greater than 90 degrees.
4. Pentagon - A polygon with 5 sides.
5. Hexagon - A polygon with 6 sides.

If you need help with specific questions related to these shapes, please let me know!

Would you like a detailed explanation or solution for any specific part of this image? Here are some questions you might consider:

1. How do you calculate the area of a decagon?
2. What are the properties of a quadrilateral?
3. How do you classify triangles based on their angles?
4. What is the formula for the internal angles of a pentagon?
5. How do you calculate the perimeter of a hexagon?

Tip: For any regular polygon, the sum of the interior angles can be calculated using the formula $(n-2) \times 180^\circ$, where $n$ is the number of sides.