Triangle sum theorem The sum of the interior angle measures

Last updated: 11/2/2023

Triangle sum theorem The sum of the interior angle measures of a triangle is 180 A D 1 Proof B 1 DE 2 Given AABC with DE AC Prove ml m 2 m 3 180 2 21 DBA 3 C F 3 m1 m DB 1 Civer Oiver