The exterior angle of a triangle is equal to sum of two opposite interior anngles

 

Geometry Explorer

Exterior Angle Theorem • Class 9

Theorem Statement

"The exterior angle of a triangle is equal to the sum of the two opposite interior angles."

Live Calculations

∠A (Interior) 0.00°

∠B (Interior) 0.00°

Sum (∠A + ∠B) 0.00°

∠ACD (Exterior) 0.00°

✅ Verified: Sum = Exterior Angle

Theoretical Proof

Step 1: Triangle Property

∠A + ∠B + ∠ACB = 180°

Step 2: Linear Pair

∠ACB + ∠ACD = 180°

Step 3: Conclusion

∠ACD = ∠A + ∠B

Observation Log

No.	∠A+∠B	∠ACD	Result

Concept Challenge

Score: 0

Trial recorded successfully!

Designed by Govinda Paudel, Sky Rider School, Chitwan