I really don't understand this...

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?

Atemperature of 1.64◦f corresponds to answer in units of ◦c.

Aline passes through 3,7 and 6,9 what equation represents the line