The third angle of a triangle is the same size as the first. The second angle is 4 times the third. Find the measure of angles.
1 answer:
Answer:
1st angle 30°
2nd angle 120°
3rd angle 30°
Step-by-step explanation:
Let's call
A = 1st angle
B = 2nd angle
C = 3rd angle
In every triangle it holds
A + B + C = 180°
Now, if the third angle of the triangle is the same size as the first
A = C
If the second angle is 4 times the third
B = 4C
we have then
C + 4C + C = 180° ===> 6C = 180° ===> C = 30°
If C = 30° then A = 30° and B = 120°
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