A rectangular iron block, 15cm in length, 10cm in width and 5cm in height. Forge it into a cylinder with 25cm in bottom. How high is the cylinder?

A rectangular iron block, 15cm in length, 10cm in width and 5cm in height. Forge it into a cylinder with 25cm in bottom. How high is the cylinder?

Volume = 15 × 10 × 5 = 750 cc
H = 750 △ 25 = 30cm

Given that the length of line AB is 10cm, and the distances between point a and line B and line L are 5cm and 3cm respectively, how many lines are there?

4

Given that the length of line AB is 10cm, and the distances from point a and B to line m are 5cm and 3cm respectively, then there are several qualified lines

Take two points AB as circles with radius of 5 and 3 respectively. The two circles are separated, and there are only four common tangent lines,
In other words, there are four conditions
Contact me