the triangle ABC., BC = 12cm, ABC = 80 degree and ACB = 30 degree

Calculate the area of triangle ABC.

asked by Kd
today at 3:06pm
angle BAC = 180-80-30 = ....
now find AB using the Sine Law.

Area of triangle = (1/2)(AB)(BC)sin80° = ....

you do the button-pushing.
Let me know what you get.

Is that correct
sin70/a = sin80/12

1 answer

No, you are not matching them up correctly

should be :
sine(angle1)/side opposite that angle1 = sin(angle2)/side opposite angle2

so sin30/AB = sin70/12

continue ....