bryan12376
21.07.2019 •
Mathematics
In the diagram,cd is tangent to the circle, ab = 6 in, and bd = 10 in. find ad.
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Ответ:
we know that
AB=6 in-----> this is the radius of circle
BC=AB-----> 6 in
AC=12 in-------> is the diameter of circle
BD=10 in
in the right triangle BCD
Applying the Pythagoras theorem
BD²=BC²+CD² --------> CD²=BD²-BC²-----> CD²=10²-6²----> CD²=66
CD=√66 in
in the right triangle ACD
AD²=AC²+CD²-----> AD²=12²+(√66)²----> AD²=144+66----> AD²=210
AD=√210 in-----> AD=14.49 in
the answer is
AD is 14.49 in
Ответ:
D
Step-by-step explanation: