Figure abcd is a rhombus.
if angle 1 = 115° and angle 6 = 40°, what is angle 8?

<B i.e. <1 = 115

<B = <ADC or angle 4 = 115 [Opposite angles of rhombus are equal]

angle 4 = angle 5 = 115[Being vertically opposite angles]

angle 6+ angle 5 = angle 8[Exterior angle of a triangle is equal to sum of two interior opposite angles]

or, 40+115 = angle 8

or, angle 8 = 155

answer: what are the following choices

you need to rotate this triangle about the origin 270 degrees clockwise to create the full square.