geometry
posted by tia .
AB is 9cm and AC is 19cm calculate the lenght of BC if the angle is a 90 degress

Pythagorean theorem:
a^2 + b^2 = c^2
9^2 + 19^2 = c^2
81 + 361 = c^2
442 = c^2
21.0238 = c
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