Answer:
a) 
b) 12.72 units
Step-by-step explanation:
Recall that the sine and cosine are completed functions.
This means that: 


Recall that: sine ratio is opposite/hypotenuse

This implies that:



Separate it into two different shapes
Good for Caleb, he better have bought cheese.
2m+3=23
2m=20
m=10
let me know in the comments if you need further explanation :)
<span>The sum of the interior angles of a triangle is 180 degrees
</span>
4x + 5x + 6x = 180
15x = 180
x = 180/15
x = 12
<span>The measure of the smallest angle = 4x = 4*12 = 48</span>°