90 degrees
90 degrees 45 degrees
90 degrees 45 degrees 45 degrees
Explanation:
1+2+1 = 4
Now pretend they were 1x + 2x + 1x to get 4x & solve for x (since angles in a triangle adds to 180.)
4x = 180
÷4
x =45
(1x is the same as x, so 1 part of the ratio is worth 45 degrees)
2x is:
45 x 2 = 90
So, 45 + 45 + 90 gives 180.
Thus, the angles are:
90 degrees
45 degrees
45 degrees
Creating a right angle triangle.
Hope this helps!