Two triangles can be similar if their leg lengths are in proportion with each other, regardless of size. Since the triangles are the same in different sizes, they are similar. The hypotenuse of the triangles isn't the same, but the angles are the same, so the hypotenuse will still follow the same line.
A central angle : π / 6 = 30 ° 30 ° = 360 ° / 12 The area of the sector is 1/12 of the area of a circle. Therefore area of the sector is: A = 36 π / 12 = 3 π Answer: A ) 3 π in²