Page 166 - Maths Class 04

12 Patterns

Given below are different numbers of dots used in making a triangle. Observe

them and find the pattern.

1+2=3 1+2+3=6 1+2+3+4=10 1+2+3+4+5=15

Pascal’s Triangle 1

This pattern is named after the French
1 1
mathematician Blaise Pascal.
This triangle itself is made by
1 2 1
arranging numbers. Each number in
the triangle is the sum of the pair of
1 3 3 1
numbers directly above it.

1 4 6 4 1

Rectangular Number

Observe and understand how we form rectangular numbers.

2×1=2 3×2=6 4×3=12 5×4=20

Mathematics-4 166