What is 4/9 + 7/18 in simplest form?

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

What is the difference between the equations of a vertical and a horizontal line?

The floor of a building consists of 3000 tiles which are rhombus shaped and each of it's diagonals are 45 cm and 30 cm in length. find the total cost of polishing the floor, if the cost per m² is rs. 4.