1+2+1+1+2+3+4+5+2+1+4+2+5+2+341

What situation is an example of an observational study

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?

Is the figure congruent? yes or no?