

Geometry problems (30..39) 




problems 21..29 


problems 40..49 
30.
Calculate angle x:
31.
Calculate x in the picture below:
32.
In picture below AB=BC=CA=CD=AE.
Prove that BC=3.AF
33.
Calculate the area of rectangle ABCD if BD=10.
34.
Given is square ABCD with some angles.
Calculate LAEF.
35.
Calculate angle x in picture below.
36.
Prove that r^{2} = ab
37.
Calculate the length of x in picture below.
38.
ABCD is a rectangle.
AB=4, AD=3.
E is a random point on CD.
Calculate the area of triangle EFG.
39.
The triangles other than ΔABC are equilateral.
LA = 60 degrees.
Prove that area S + S_{2} = S_{1} + S_{3}.

