Question

solve in copy and explain very fast plz plz...​

Answer 1

Step-by-step explanation:

Solution:

(a) Given, side of a square = 10 cm

We know that, perimeter of a square = 4 x Side = 4 x 10

= 40 cm

∴ Perimeter of old square = 40 cm

Now, according to the question, side of the square is doubled.

New side =2 x 10 = 20 cm

Again, perimeter of new square = 4 x Side

= 4 x 20 = 80 cm

∴ New perimeter

= 2 x (Old perimeter)

= 2 x 40 = 80 cm

Hence, the new perimeter is 2 times of the old perimeter.

Answer 2

Step-by-step explanation:

divide the figure in two parts...rectangle nd triangle...consider the triangle with side 5 cm nd 12 cm so its 3rd side = 13=OP

so perimeter =10+12+15+13=50cm