How does 541 = 514. i dont know how to do this so plz write back

How do you find the circumfrance of a circle?

Consider a cube that has sides of length l. now consider putting the largest sphere you can inside this cube without any point on the sphere lying outside of the cube. the volume ratio -volume of the sphere/ volume of the cube is 1. 5.2 × 10−1 2. 3.8 × 10−1 3. 1.9 4. 2.5 × 10−1 5. 3.8

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