Question

Solve the following:
23] Prove that Euler's formula F+ V - E = 2,
verify it for the solid Cube
24] Simplify : (a-3)5 x (a 2)6 x (a%)5
a2
25] If the cost of 8 waterbags is Rs. 560, what will be the cost of 5 such waterbags ?
26] Find the total surface area of a closed cylinder whose radius is 14 cm and height is 8 cm​

Answer 1

23. cube has 6 faces, 8 vertices and 12 edges

so 6+8-12=2

so proved

24. question cannot be understood.

25.8 waterbags cost 560

1 waterbag cost 560/8

5 waterbags cost 70*5=350

26. 2πr^2+ 2πrh

or 2*(22/7)*14*14 + 2*(22/7)*14*8

or 1232+704= 1936