Question

find circstance of a circle if radius = 40 cm , if diameter is 20.5cm [take value of pie 3.14]​

Answer 1

Answer:

Í) C≈251.33

ÍÍ) C≈128. 81

Step-by-step explanation:

Circumference of circle

$2\pi \: r$

$= > 1)2 \times 3.14 \times 40 \\ = > 251.33$

$= > 1)2 \times 3.14 \times 20.5 \\ = > 128.81$

Answer 2

Answer:

ans of 11:- (slant height)²=(one side)²+(other side)²

ans of 12) 1):-1256

                2):-84.37

Step-by-step explanation:

12)1):- circumference of circle=2$\pi$r²

                                               =2×3.14×40

                                                =1256cm

12)2):-circumference of circle:- $\pi$d

                                                =3.14×20.5

                                                =84.37