Answer:
1. X = 23.8 cm
2. Z = 12.5 Inches
3. x = 14.03 Degrees
Explanation:
1. Given 
Hypotenuse=25 cm 
Angle=18 Degrees 
We will use the trigonometric ratios for right angled triangles for finding the value of X. 
In the given triangle, as X is the base, we will use the ration which involves base and hypotenuse. 
So, 
cosθ= Base/Hypotenuse 
cos18=X/25 
0.9510=X/25 
0.9510*25=X 
X=23.775 
X=23.8 cm 
2.The ratio of cos will be used for this one too. 
Here, 
Base=10 inches 
Angle=37 Degrees 
cosθ= Base/Hypotenuse 
cos37=10/Z 
0.7986=10/Z 
Z=10/0.7986 
Z=12.521 
Z=12.5 inches 
3. As we know the values of perpendicular and base , 
So the ration which involves these both will be used. 
The desired ratio is 
tan x=Perpendicular/Base 
tan x=5/20 
tan x=0.25 
x = tan^(-1)0.25 
x = 14.03 Degrees ..