Carcass wrote:
mmmmmhhhh
something is wrong here at a closer look
If we use the unknown multiplier based on the ratio
we do have that 3x+5x+7x=180 (the sum of all angles in a triangle)
15x=180
x=12
7*12=84
The largest angle must be 84 and the answer is C and NOT A
I edit the OA accordingly
Hello,
At first, I thought this would've worked as well, using the same ratio for angles. But I think this only works for an equilateral triangle?
Just to give a quick example, using a right triangle with two equal angles we'd have the ratio of angles equal to 45:45:90, or 1:1:2. But the sides wouldn't have the same relationship because by rule, the sides would have the ratio of 1:1:\sqrt{2}. So technically, I don't think you could apply the ratio for sides to angles?
Thanks again for the responses. Thought this was an interesting question. Maybe knowing that the angles ratio deviates more than the sides ratio is enough to answer the question (as in, knowing that the largest angle is greater relative to the other angles compared to the largest side relative to other sides would be enough to know this angle > 84 deg)