Attention Math

Class 10 · Chapter 11 · Mensuration

Areas Related to Circles

Sectors, arcs and segments: slices of a circle, measured as shares of the whole.

Source: NCERT Mathematics, Class 10

  1. 11.1Area of a SectorAttention · Look at θ/360: it is the share of the circle you have.8 min
  2. 11.2Length of an ArcAttention · Look at which whole the fraction is taken of: the circumference.6 min
  3. 11.3Area of a SegmentAttention · Look at the triangle inside the sector: it has to come out.10 min
  4. 11.4Major Sectors: Use What's LeftAttention · Look at the angle that's left over: 360° − θ.6 min

Problems

The clue is in the question

All 1 problem
  1. 1Four quadrants in a squareABCD is a square of side 14 cm. Four quadrants of radius 7 cm are drawn with the vertices as centres. Find the area of the part of the square outside the quadrants. (Use π = 22/7.)Lens · The symmetryNCERT Ex 11.1 style