Area of non right angled triangle Education Community › Mathematics › Grade 8 Mathematics › Area of non right angled triangle This topic contains 1 reply, has 2 voices, and was last updated by noah futter 4 months, 2 weeks ago. Author Posts November 6, 2018 at 10:50 PM #644 Cameron RoacheParticipant Intermediate Colearner How do you calculate area of a triangle if it’s not right-angled? How do you get the height? November 6, 2018 at 10:57 PM #647 noah futterParticipant Beginner Colearner Use the perpendicular height (the longest perpendicular line from the highest point to the lowest point of the triangle). Author Posts You must be logged in to reply to this topic.