Answer: Add them up, if there’s an missing angle or unknown angle then remember this, if it’s a 4 side shape the sum is always 360 degrees and if it’s a triangle it’s always 180 degrees, if it’s more then 4 then count the sides and multiply the sides by 90 and that’s your sum, after you figure that out make an equation and solve the equation and you have the missing angle!
Explanation: