Can someone do this please

What is the size of the matrix resulting from

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?

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?