Question

Solve for y (multiple variables interior triangle)

Answer 1

Hey mate here's your answer -:

We can see in the figure that the given triangle is equilateral. Hence, it's all angles would be 60°.

4y = 60°

y = 60 ÷ 4

y = 15°

x+20 = 60°

x = 60 - 20

x = 40°

Answer 2

On seeing the figure clearly, we may conclude that every side is equal. It means every angle are equal to each other.

So, x+20 = 4y

=> x-4y = -20 ---------- (i)

Let third angle also be 4y

Then, by Angle sum property,

x+20 + 4y + 4y = 180

x + 8y = 160 ---------(ii)

On solving equation i and ii, We get

y = 15° ans.

Hope this helps!