PLEASE HELP ME I"LL MARK BRAINLIEST PLEASE

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse

A3cm×3cm\greend{3\,\text{cm} \times 3\,\text{cm}} 3cm×3cm start color greend, 3, space, c, m, times, 3, space, c, m, end color greend rectangle sits inside a circle with radius of 4cm\blued{4\,\text{cm}} 4cm start color blued, 4, space, c, m, end color blued . what is the area of the shaded region? round your final answer to the nearest hundredth.