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If these two sides are opposite to these angles, and you know one of the angles, you can use the Law of Sines to find the other angle.

For example, in the triangle ABC the side a is opposite to the angle A, and the side b is opposite to the angle B. If you know the lengths of these sides, a and b, and you know the measure of the angle B, then

sin A/a = sin B/b multiply by a to both sides;

sin A = asin B

Use your calculator to find the value of arcsin(value of asin b), which is the measure of the angle A. So,

Press 2ND, sin, value of asin B, ).

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โˆ™ 2009-01-07 00:18:58
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Q: How do you find an angle when you know one other angle and two of the sides of a triangle?
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Continue Learning about Geometry

How do you find the side length on a triangle with one angle given?

To find side lengths on a triangle, you need to know at least one of the sides. The possible combinations for solving* a triangle are: side, side, side; side, angle, side; angle, side, angle; angle, side, longer side. *To solve a triangle is to find the lengths of all the sides and the measures of all the angles.


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How do you find the area of an isosceles triangle with 2 equal sides and 1 angle?

It really depends on the angle. If the angle is at the point where the two equal sides intersect then you can divide the triangle into two equal parts (forming a right angle with the base), divide the angle by two, then use the following equation(side*arccos(your angle/2))*((side*arcsin(your angle/2)))if the angle is not where the two equal sides intersect then you can divide the triangle into two equal parts (from the point where the two equal sides intersect down to a right angle with the base) then use the following equation.(side*arcsin(your angle)*(side*arccos(your angle))


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take the number and divide it by 180 if it's a triangle


How do you find the angle opposite of the hypotenuse of a triangle with all three sides known?

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Related questions

If you have two sides of a triangle how do you find the other side?

You need to know the angle between them.


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How do you find an unknown angle of a triangle without having a length of one of the sides using sohcahtoa?

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How do you find the side length on a triangle with one angle given?

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How do you find the hypotenuse of a right triangle when you don't know the other two sides?

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The cosine rule which is: a2 = b2+c2-2*b*c*cosine A This is used to find the third side of a triangle when the two other sides are known along with the angle between them. Used when the triangle is not a right angle.


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How do you construct an isosceles triangle when base and angle at the vertex is given?

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