Question

10)In a hot water heating system there is a cylindrical pipe of length 28m and diameter 5 cm. Find the total radiating surface in the system.

11)If the diagonals of a parallelogram are equal then show that it is a rectangle.

12)Show that the diagonals of a square are equal and bisect each other at right angles. ​

Answer 1

Answer:

the cylinder kal pipe radiates from the curved surface and not from the and so we need to find curved surface area of cylinder height of cylindrical pipe is equal to 28 metre radius of circular in the 5 is equal to 5 by 2 cm is equal to 2.5 cm is equal to 2.5 X 11 by hundred metre is equal to 0.025 M total radiating surface in the system is equal to c5a of cylinder kal pipe is equal to 2 is equal to 2 X 22 by 7 x 0.025 x 28 M raise to 2 is equal to 4.29