Asked by Anonymous
Two sides of a triangle measure 20 cm and 28 cm. If the area of triangle is 277.13 cm2 how long is the third side in cm?
Answers
Answered by
oobleck
The area is 1/2 bc sinA so 1/2 20*28 sinA = 277.13
Now, knowing A,
a^2 = b^2 + c^2 - 2bc cosA
Now, knowing A,
a^2 = b^2 + c^2 - 2bc cosA
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