The ratio of two angles of a triangle is 5:4, and the sum of the angles equals the third angle. Find the smallest angle, in degrees.	Select the correct option: A) 40 B) 45 C) 50 D) 55 E) 10
The three angles are 5x, 4x, and (5x+4x)=9x for some value x, due to the ratio. [note that 4x is the smallest angle]   The three angles of a triangle add up to 180, so   5x+4x+9x   (5 +4 )= 
<gadget id="calculator">  (5 +4 )</gadget>
<output>9</output>
9x for some value x, due to the ratio. [note that 4x is the smallest angle]   The three angles of a triangle add up to 180, so   5x+4x+9x= 180   18x = 180   x = 10   the smallest angle is 4x, so  4*10= 
<gadget id="calculator"> 4*10</gadget>
<output>40</output>
40 degrees   40
<result>A</result>
The ratio of two angles of a triangle is 5:4, and the sum of the angles equals the third angle. Find the smallest angle, in degrees.