Answer:
That would be sina.
Step-by-step explanation:
sin(a+b) = sinacosb + cosasinb
sin(a-b) = sinacosb - cosasinb
Adding we get sin(a+b) + sin(a-b) = 2sinaccosb
so sinacosb = 1/2sin(a+b) + sin(a-b)
Hi
I belive you add the top side (4) plus the bottom side (9.5) witch would equal 13.5 times the hieght (3) equals 40.5 divided by 2 equals 20.25. the area is 20.25ft squared
another way to do it
4+9.5= 13.5
13.5×3= 40.5
40.5÷2= 20.25ft
Answer is Rachel worked 3 2/3 hours
Step by step
Dominic worked 2 3/4 hours
Rachel worked (1 1/3) times (2 3/4)
1 1/3 x 2 3/4. Change into an improper fraction
4/3 x 11/4. multiply across
44/12
Simplify
= 3 2/3
I’m sorry but I can’t see the photo so can you tape it out so I can furthermore assist you
AB is the longest side, so ∠C is the largest angle.
use law of cosine: 16²=9²+12²-2*9*12cosC
216cosC=81+144-256=-31
cosC=-0.14352
C≈98
