Question

Find the area of a triangle with sides of length 6 and 7 and included angle 74°. (round your answer to one decimal place.)

Answer 1

We use this formula:
Area = ½ • side 1 • sine (A) • side 2
Area = ½ • 6 • sine (74) • 7
Area = 21 • sine (74)
Area = 21*0.96126
Area = 20.18646
Area = 20.2 (rounded)
Source:
http://www.1728.org/triang.htm