Help me get the answers

The triangles are similar. what is the value of x? enter your answer in the box. x = two right triangles. the larger right triangle is labeled x on the longer leg, 12 on the shorter leg and 20 on the hypotenuse. the smaller triangle is labeled 4 on the longer leg, 3 on the shorter leg, and 5 on the hypotenuse.

In the diagram below, tan θ = sqrt 3. what is the value of m?

What is the square root of 45? (step by step working plz)