Question 34197
in right triangle we know one angle is 90 degrees
but we also know that the sum of measures of the three angles in a triangle is 180 degrees

also given one angle is 45 degrees

so the measure of third angle is:

x + y + z = 180
let x = 90 and y = 45
90 + 45 + z = 180
z = 180 - 45 - 90 = 45 

so the three angles are 45, 45, 90


Perimeter of triangle = a+ b + c 
a = 4 m ;b = 2.3 m ;and c = 3.7m
perimeter = 4+2.3+3.7 = 10 m