The two base angles are congruent or equal measure. Find one angle and use the 180 degree rule and you can find all three.
The answer depends on what information you have, If you know only the lengths of the sides, you use the cosine rule to find the measure of one angle and then the sine rule to find the other angles.
By using the Sine rule: a/sinA = b/sinB = c/sinC
The answer depends on what information you do have. If you have all three sides, you use the cosine rule to find any one of the angles and then use the sine rule to find the other two.
(number of angles -2)*180
They are supplementary angles / The sum of their measures are 180 degrees.
Let the angles be A B C and their opposite sides be a b c and use the cosine rule to find the first two angles and then deduct them from 180 degrees to find the third angle and so therefore it follows that the angles are: 88.05 degrees, 52.01 degrees and 39.94 degrees.
RULE IT!!!!!!!!!!!!!!!!!(seriously)
to find missing angles you are dealing with complementry and suplementry angles. Suplementry angles add up to 180 degrees so you must subtract what given angle you have from 180 and you come up with youre missing angle. This rule also gos for complementry but the angles must add up to 90 degrees
Yes. The general rule for angles is that the sum of the angles must be 180 degrees.
(number of sides - 2)*180 = total sum of interior angles
If it's not a right angled triangle and you don't have any of the angles but have the values of all three sides, then you need to use something called the Cosine Rule.