In 8th Grade, students are expected to have a good understanding of the Pythagorean Theorem and its application. To test students' understanding of the Pythagorean Theorem and isoscles triangle teacher can use “Find missing side lengths in an isosceles triangle Quiz”. In this quiz, students are asked to find the length of the missing side of the isosceles triangle whose one side and altitude are given. Using this quiz, teachers can easily identify the knowledge gaps of the students and help them to understand this concept better.