Answer:
17.8 cm^2
Step-by-step explanation:
The basic formula for area is bh/2
In this situation, we don't have the height given so we need to use trigonometry to figure it out.
We need to make an imaginary right triangle like in the picture. Then use sine to find the height (h)
sine is opposite over hypotenuse
Sin 37= x/13.1
Multiply 13.1 to both sides
13.1 sin37=x
sin37= 0.60181502315
13.1(0.60181502315)=7.88377680327
We can round it to 7.9
The height is 7.9
Now we just plug it into bh/2
4.5(7.9)/2=17.775
We can round it to 17.8 cm^2
