Explain why a two-dimensional net is useful for finding the surface area of a three-dimensional figure. answer as soon as possible plz

Anyone know? is appreciated! will mark brainliest if correct!

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days

The distance of a chord from the centre of a circle is 12cm and the lenght of the chord is 10cm. find the radius of the circle