1. Both triangles have the same shape and size
Both triangles have the same angles and if one side is the same size then both of them are EQUAL.
2. Line FG has a length of 5 units
Both triangles are equal, therefore line AC is equal to line FG. AC is 5 units long.
3. 23 Degrees
106 + 51 = 157
180 - 157 = 23
The other triangle also has the same angles.