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How do you find an angle in a triangle using the area and two sides Area 12.5cm2 Side a 6cm Side b 5cm?
Wiki User
∙ 8y ago
That is a bit complicated. You need to know sines and cosines and more geometry.
Given area K and 2 sides a and b ,the relation is K = (1/2) (absinC); solve for angle C; then the third side c, from law of cosines is c =sqrt (a squared +b squared -2abcosC); then sin A = 2K/bc and
sin B = 2K/ac. solve for angles B and C. In your case, approximately, C = 56 degrees, A =52 degrees and B = 72 degrees
Wiki User
∙ 8y ago
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no. If it is a right angled triangle. Then using Pythagoras' formula a2 +b2 =c2
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What are the angles from smallest to greatest in a triangle that has sides of 8.3cm 5.4cm and 7.1cm?
If you know all three sides of a triangle, you can calculate the angles using the law of cosines. If you only want to know which angle is the smallest, it is much simpler: The angle that is opposite to the smallest side is the smallest angle; the angle that is opposite to the largest side is the largest angle.
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By using trigonometry or using Pythagoras' theorem for a right angle triangle.
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