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Geometry problems (30..39) |
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problems 21..29 |
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problems 40..49 |
30.
Calculate angle x:
![](../geo37/fig1.jpg)
![](pictures/solution.jpg)
31.
Calculate x in the picture below:
![](../geo38/fig1.jpg)
![](pictures/solution.jpg)
32.
In picture below AB=BC=CA=CD=AE.
Prove that BC=3.AF
![](../geo39/fig1.jpg)
![](pictures/solution.jpg)
33.
Calculate the area of rectangle ABCD if BD=10.
![](../geo40/fig2.jpg)
![](pictures/solution.jpg)
34.
![](../geo41/fig1.jpg)
Given is square ABCD with some angles.
Calculate LAEF.
![](pictures/solution.jpg)
35.
Calculate angle x in picture below.
![](../geo42/fig1.jpg)
![](pictures/solution.jpg)
36.
Prove that r2 = ab
![](../geo43/fig1.jpg)
![](pictures/solution.jpg)
37.
Calculate the length of x in picture below.
![](../geo44/fig1.jpg)
![](pictures/solution.jpg)
38.
![](../geo45/fig1.jpg)
ABCD is a rectangle.
AB=4, AD=3.
E is a random point on CD.
Calculate the area of triangle EFG.
![](pictures/solution.jpg)
39.
The triangles other than ΔABC are equilateral.
LA = 60 degrees.
Prove that area S + S2 = S1 + S3.
![](../geo46/fig1.jpg)
![](pictures/solution.jpg)
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