1.) C = 90 degrees, b = 7, c = 12
angle A
cos A = 7/12
A = cos^-1(7/12)
= 54.315 degrees
angle B
sin B = 7/12
B = sin^-1(7/12)
= 35.685 degrees
length of a
tan 54.315 = a/7
(7) tan 54.315 = a/7 (7)
a = 7 tan 54.315
a = 9.747
area
A = 1/2 bh= 1/2 (7) (9.747)= 34.115
2.) two sides of a triangle have the lengths 7cm & 4cm. the angle between the sides measures 73 degrees. Find the area of the triangle.
1/2 (7) (4) sin (73) = 13.388 cm^2
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Thanks for this amy because i didnt really understand how to do area. It seems like the easiest thing but i just never understand what to do.
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