Triangle Inequality | Class 7 Maths Ch 7 | NCERT Ganita Prakash

In this lesson: • Can sticks of 2 cm, 3 cm and 7 cm make a triangle? • Hinged sticks: 2 + 3 = 5 cannot reach across 7 • 3, 4, 7 lies flat; 4, 5, 7 makes a real triangle • Triangle inequality: any two sides add to more than the third • Only the two shorter sides need checking against the longest • Village roads: a detour is always longer than the straight road • Trap: a pair that includes the long side always wins NCERT Ganita Prakash, Class 7 — Chapter 7: A Tale of Three Intersecting Lines