Please help!

If these two shapes are similar, what is the measure of missing length h?

Aman steps out of a plane at a height of 4,000m above the ground falls 2,000m very quickly and then opens his parachute and slowly falls the remaining 2000m to the ground what height above the ground would be the best choice for a reference point

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

Find the distance between (0,5) & (-4,2)