Law of Cosines . . .A surveyor is mapping a triangular plot of land.
Two of the sides are 400 and 200 yards and the included angle is 50░.
(a) What is the length of the third side of the triangle, to the nearest yard?
Formula: .(b) What is the area of this plot of land, to the nearest square yard?
. . The area is one-half the product of two sides and the sine of the included angle.
Therefore: . square yeards.