SURYAMG

Class 9 Mathematics — Chapter 7: Triangles

Latest NEP-2020 & Rationalised Syllabus Aligned
info Syllabus Note: Under the rationalised syllabus, "Inequalities in a Triangle" (old Exercise 7.4) has been completely removed. This lab focuses purely on the core congruence criteria (Ex 7.1 & 7.3) and isosceles properties (Ex 7.2).
explore Select a lab below to verify triangle congruence criteria, investigate isosceles roof trusses, or configure RHS right-angled shapes!
Axiom 7.1 & Theorem 7.4 Engine
Congruence plane
Reference Triangle ABC and Target Triangle PQR
A B C P Q R
check_circle Perfect Congruence! ΔABC ≅ ΔPQR (CPCT holds true).
Reference Triangle ABC Target Triangle PQR (Modify to Match)

settings_suggest Symmetry Controls

Live Metrics Comparison

ΔABC (Ref)

ΔPQR (Target)

Try This: Drag node A on the canvas to reshape the reference triangle, then adjust the sliders to align ΔPQR. Click "Superimpose" to physically overlay the triangles and check if they coincide.