A few days ago
The second angle of a triangle is twice the first angle.?
The second angle of a triangle is twice the first angle. The third angle is 20 degrees more than the first angle. Find the first angle.
Top 2 Answers
A few days ago
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The sum of all angles of a triangle must equal 180 degrees. Therefore, the first angle equals 40 degrees, the second angle equals 80 degrees and the third angle equals 60 degrees.
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A few days ago
Lets make the first angle a variable, x.
so, x (angle 1) + 2x (angle 2) + (x+20) (angle 3)= 180 (total degrees is a triangle)
it looks like: x+2x+(x+20)=180
or x+2x+x+20=180
combine like terms-
4x+20=180
subtract 20
4x=160
divide by 4
x=40
so, your first angle is 40 degrees.
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