Question

find the value of ay+by=?​

Answer 1

Answer:

The angles ∠AOF=∠COD

∠AOB=∠EOD

∠FOE=∠BOC

The sum of angles at a point is 360

⟹6y+6y+8y+8y+4y+4y=360

18y=180

y=10

∘

Step-by-step explanation:

Pls mrk me as the brainliest

Answer 2

Answer:

Correct option is

A

2r

ab

Given, p=ax+by⟶(1)

and xy=r

2

⇒y=

x

r

2

Putting the value of y in equation (1) we get,

p=ax+

x

br

2

⇒

dx

dp

=a−

x

2

br

2

⟶(2)

For minimum value of p,

dx

dp

=0

So, from equation (2) we have,

a−

x

2

br

2

=0

⇒a=

x

2

br

2

⇒ax

2

=br

2

⇒x

2

=(

a

b

)r

2

⇒x=r(

a

b

)

2

1

,−r(

a

b

)

2

1

But, x=−r(

a

b

)

2

1

is imaginary.

Again,

dx

2

d

2

p

=

x

3

2(br

2

)

Putting x=r(

a

b

)

2

1

we get

dx

2

d

2

p

=positive

∴ Minimum value of p at x=r(

a

b

)

2

1

,

ax+

x

br

2

=ar(

a

b

)

2

1

+

r(

a

b

)

2

1

br

2

=r(ab)

2

1

+(br)(

b

a

)

2

1

=r(ab)

2

1

+r(ab)

2

1

=2r(ab)

2

1

=2r

ab

.