Question #2fd6c Geometry Right Triangles and Trig Special Right Triangles 1 Answer Narad T. Mar 13, 2017 The length is #=13.2cm# Explanation: We apply Pythagoras' theorem #a^2+b^2=c^2# #a^2+15^2=20^2# #a^2=20^2-15^2# #a=sqrt(20^2-15^2)# #a=13.2cm# Answer link Related questions The length of the small leg of a 30°-60°-90° triangle is 3. What is its perimeter? What is a 30-60-90 triangle? Please give an example. What is a 45-45-90 triangle? Please give an example. Given a 30-60-90 triangle in a polygon, for example, how can the apothem be used to find the... In a 30-60-90 triangle, where the long leg is 12, what is the length of the short leg? In a 30-60-90 triangle with a hypotenuse of length 9.8, what is the length of the longer of the two legs? In a 30-60-90 triangle, where the shortest leg equals 3, what could the other sides equal? In 30-60-90 triangle, where the length of the long leg is 9, what is the length of the... If the shortest leg of the 30-60-90 triangle is 8.5 ft, then what is the perimeter? A 30-60-90 triangle has a hypotenuse with a length of 10. What is the length of the longer leg? See all questions in Special Right Triangles Impact of this question 1964 views around the world You can reuse this answer Creative Commons License