Question

Answer both....plzz​

Answer 1

Answer:

18. sin(90-2A)=sin(A-15) (cos A=sin(90-A))

90-2A=A-15

3A=105

A=35

hope it helps you....

Answer 2

explanation:

given,

diameter of smaller coin = 2cm, then radius is 2/2= 1

let the radius of smaller coin be r,

diameter of larger coin = 4cm, then radius is 4/2= 2

let the radius of larger coin be R

Area of shaded figure= area of larger circle - area of smaller circle

= πR²- πr²

= π(R²-r²)

substitue the values

= π(2²-1²)

= π(3)

= 22/7 x 3= 66/7 or 9.42cm²