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Find the measure of ZJ, the smallest angle in a triangle with sides measuring 11, 13, and 19. Round to the nearest whole degree. O 30° O 34° o 42° O 47°
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Mar 15, 2022
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Find the measure of ZJ, the smallest angle in a triangle
with sides measuring 11, 13, and 19. Round to the
nearest whole degree.
O 30°
O 34°
o 42°
O 47°
Mathematics
college
Gilbertc
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Make A the subject
2bc.cos(A) = b^2 + c^2 - a^2
cos(A) = (b^2 + c^2 - c^2) / (2bc)
cos(A) = (13^2 + 19^2 - 11^2) / (2 x 13 x 19) = 0.827935
A = 34 degrees
Judian
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Mar 21, 2022
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Judian
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