Let’s call the sides N, E, S, W as in the direction each side is facing like a compass. Side N would be 10in+5in=15in. Side E would be 4in+6in=10in. Side S would be 10in+5in=15. Side W would be 4in+6in=10in. Then you add all four sides together: 15in+10in+15in+10in=50in. Your final answer is: the perimeter is 50inches.