What is the area of the triangle shown

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?

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .