Step 1: Since this figure has 4 sides, the total degree will be 360 degrees.
Step 2: Create Equation: 41+86+133+x= 360
Step 3: Solve it: you will get the final answer of x=100
115:55 bc if you divide them both you fat the same answer which is 2
All triangles interior angles equal 180
So these 3 angles = 180
Remember them is the best way to go.
draw the exact value triangles if you're unsure, but importantly, you just need to memorise these exact values.