Question

Please help me.

b = [?]
3
b
Enter the number
that goes beneath
the radical symbol

Answer 1

b=√7

Explanation:

Every triangles are congruent

according to Pythagoras theorem

a²+b²=c²

3²+b²=4²

b²=4²-3²

b=√4²-3²

b=√16-9

b=√7