#Interior Angle

Interior Angle Sum of a Polygon | v Consider an n-sided polygon | v Draw diagonals from one vertex | v The polygon is divided into (n - 2) triangles | v Each triangle has an angle sum of 180° | v Therefore: Interior Angle Sum = (n - 2) × 180° | v This depends only on the number of sides (n), not the shape of the polygon. | v End

Interior angle formula comes from polygon angle sum: Total = (n-2)x180°, so each angle = (n-2)×180°/n #maths

Regular Polygon ke har interior angle ko ab 10 sec me find karo! 📐✨ Bas yaad rakho ye simple formula 👉 (n − 2) × 180° / n Pentagon ho ya Decagon 😎 har regular polygon ka angle aasani se nikalo! Maths ko easy banao, formula lagao aur topper bano 💯🔥 #MathsTrick #RegularPolygon #InteriorAngle #MathsMadeEasy #LearnWithFun

Quickly, let’s look at what DR CPT is about: D - diameters (check the diagram for diameters, if they are present the theorem angle in semi circle could be present) R - radii (these are equal in length and could form isoscele’s triangles) C - centre of circle (if this is provided then watch out for theorem 1 and 2). “”C”” also represents cyclic quadrilaterals. If you spot one remember the two theorems (1) opposite interior angles of a cyclic quadrilateral are supplementary and (2) the exterior angle of a cyclic quadrilateral is equal to the opposite interior angle. P - parallel lines (recall from grade 9 alternate, corresponding and co-interior angles) T - tangents (now be careful of the 3 tangent theorems (1) tangents from a common point (2) tangent perpendicular to radius (3) tan chord theorem) At this point, it might seem like nonsense, but I promise after attending the R49 masterclass on the 3rd of September 2025 @ 6pm - 8pm you’ll see exactly how easy it is to score marks using this method. This is session is suitable for grade 11 and 12 students who want to brush up on their circle geometry theorems before mock exams. Now you’re wondering how do you book your spot, right? CLICK THE LINK IN OUR BIO! But there is a catch... spots are limited to the first 100 students ready to level up! Reach out to us on WhatsApp: 065 953 1496 or email [email protected] if you have questions. #studentsolutions101 #studyhelp #maths #euclideangeometry #grade11

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