I see that you have uploaded a photo containing several mathematics problems. I'll help you solve them step by step. Here is a summary of the questions:

Questions in the Image:

1. Perimeter and ratio of sides of a parallelogram.
2. Area and perimeter of a right triangle.
3. Area of a triangle using side lengths.
4. Area and perimeter difference for a square.
5. Value of the smallest angle in a right-angled triangle.
6. Length of a side in a right triangle.
7. Area of an isosceles triangle.
8. Area of a right triangle.
9. Distance between two points.
10. Midpoint between two points.
11. Distance between a point and origin.
12. Equation of a straight line.
13. Equation of a line passing through a point.
14. Measure the area of a given shape.
15. Area of a quadrilateral formed by four points.
16. Values of a parameter such that points lie on a straight line.
17. Points on a straight line with given slope.
18. Perimeter and diagonal of a rectangle.
19. Area of a triangle using diagonals.
20. Perimeter of a rhombus.
21. Length of a side of a triangle.

Let's begin solving these problems one by one. Please let me know if you'd like to start with a specific question or go in order.