Question

class 10th areas related to cirles formulas

Answer 1

touching circles internally=r1+r2
touching circles externally =r1-r2
tangent secant=secant square =half tangent ×full tangent.

Answer 2

Area of the circle = πr2

Perimeter of circle = 2πr

Perimeter of the sector (minor sector)
=0 /360° x 2πr + 2r

Area of the sector OAPB =0 /360° x πr2

& length of an arc of sector OAPB = length of arc AB =0 /360° x 2πr

Area of minor segment APB — Area of sector OAPB — area of ΔOAB

Area of major segment OAQB = πr2 — area of minor segment APB.

Area of segment of a circle = Area of the corresponding sector — Area of the corresponding triangle.

AREA ENCLOSED BY THE TWO CIRCLES

If R and r are the radii of two concentric circles such that R > r then area enclosed by the two circles = πR2 – πr2