Solving Oblique Triangle скачать в хорошем качестве

Solving Oblique Triangle

This video gives one example of finding all the sides and angles of an oblique triangle when you are given the lengths of two sides and the measure of the angle between those two sides. See below for some clarification of the common questions. __________________ Finding b... 2*9*10 = 180 81 + 100 = 181 cos(109°) ≈ -0.3256 use a calculator for this. If you get -0.5770, then your calculator is set to radians instead of degrees 181 - 180*(-0.3256) ≈ 181 - (-58.6023) = 181 + 58.6023 ≈ 239.60 sqrt(239.60) ≈ 15.48 Finding A... Use b = 15.48 and use Law of Sines... 109 is the given measure of angle B sin A = (9 * sin(109°)) / 15.48 ≈ (9 * 0.9455) / 15.48 NOTE: sin(109°) ≈ 0.9455 If you get 0.8167, then your calculator is set to radians instead of degrees sin A ≈ 0.5497 After this, you need to use the inverse sine function on your calculator (and make sure your calculator is STILL set for degrees and not radians)... A = sin-1(0.5497) A ≈ 33.3478 °