As shown in the figure, the hypotenuse of Rttriangle ABC AB = 10.0, cosA = frac {3.0}{5.0}, then the length of BC is ()
Choices:
A:5cm
B:6cm
C:3cm
D:8cm
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: As shown in the figure, the hypotenuse of Rttriangle ABC AB = 10.0, cosA = frac {3.0}{5.0}, then the length of BC is ()
Choices:
A:5cm
B:6cm
C:3cm
D:8cm
Please first conduct reasoning, and then answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
Question: As shown in the figure, the hypotenuse of Rttriangle ABC AB = 10.0, cosA = frac {3.0}{5.0}, then the length of BC is ()
Choices:
A:5cm
B:6cm
C:3cm
D:8cm