Area of a square with side length of 5 cm is given by ___.
25
10
20
5
The area of a square of side length 'a' is a2.
∴ Area of a square of side length 5 cm = 5 x 5 = 25 cm2
The maximum magnifying power of a convex lens of focal length 5 cm can be :
(a) 25 (b) 10
(c) 1 (d) 6
A rectangle is 5 cm wide and 20 cm long. The ratio of its width to its length is
Perimeter of a square plot with side 2x is 40 units. Find the length of its side.