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C
|\
| \
| \
|___ \
D B
Z twierdzenia pitagorasa:
|DB|²+|DC|²=|CB|²
6²+|DC|²=7²
36+|DC|²=49
|DC|²=49-36
|DC|²=13
|DC|=√13
Wysokość=√13
H=2*a
h=2*6
H=12cm
6²+C²=7²
36+C²=49
C²=49-36
C=√13