How do you find the scale factor between shape b and shape a ?

1. what is the measure of ∠abc? what is the measure of ∠abd?

The radius of the circle is 4 cm and the measure of the central angle is 90° the area of the sector with a central angle measuring 90° and radius of length 4 cm is vt cm the triangle in the sector is 4 cm the area of the triangle is v/cm² the area of the segment of the circle is (471 - ) cm?

Solve 3x-18=2y and 5x-6y=6 by elimination show work