Let’s assume the size of angle B is x degrees. According to the given information, angle A is 5 times bigger than angle B, so angle A = 5x degrees. In a 360-degree turn, the sum of all angles is 360 degrees. Therefore, we can write the equation as: x + 5x + 90 + 90 = 360 Combining like terms, we get: 6x + 180 = 360 Subtracting 180 from both sides, we have: 6x = 180 Dividing both sides by 6, we get: x = 30 Therefore, the size of angle B is 30 degrees.