What are the possible flavour outcomes for this diagram? Please help

In the rectangle below ac=30 units what is de

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?

Divide. write in simplest form 41/6 divided by 10