Question

class 7 ncert ch 12 and 6 math​

Answer 1

Step-by-step explanation:

1st question answer is

perimeter = 2(l+b

= 2 ( 40 + 2 ( 20

= 80+40

= 120

3 question answer is

Pythagoras theorem

a^2 + b^2 = √c

a^2 + 12^2 = 225

a^2 + 144 = 225

a^2 = 225 - 144

a^2 = 81

a = √81

a= 9m

Answer 2

Answer:

1) the perimeter of the rectangle is 98 cm.

3) The ladder = 15m

windows from ground = 12 m

Distance of ladder from ground

Distance of food of ladder from wall = a^ 2 =225 - 144

a ^ 2 = 81

a =

$\sqrt{81}$

d = 9 cm