Classify the triangle based on angle measures. and show how you got to the answer

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?

The table above shows approximate conversions from gallons to liters. what is the value of x?

Asap! i'm not good math and i'm lost.