Question

The sum of radius of two circles 140 cm and dufference of their circumference is 88cm find the diameters of the circle

Answer 1

r₁+r₂=140

$2\pi r_1+ 2\pi r_2=88$$2\pi (r_1-r_2)=88\\r_1-r_2=88/2\pi \\\pi =22/7\\therefore,\\r_1-r_2=14$

 r₁₊r₂=140

+r₁-r₂=14

⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻

2r₁=154

r₁=77

r₁+r₂=140

77+r₂=140

r₂=63

therefore diameter of circle 1 of radius 77= 2*77=154 cm

and diameter of circle two of radius of 63= 2*63=126 cm