Question

बहुपद
4. अचर बहुपद
प्र. 10 दी हुई A.P. के प्रथम चार पद लिखिए जबकि, प्रथम पद a = 10, सर्वान्तर d = 10 है। 2
अथवा
ADEF~APQR दिया है। क्या कहना सत्य है कि <D =<R और <F-<P क्यों?
A
2​

Answer 1

Radius (r1) of 1st circle = 19 cm

Radius (r2) or 2nd circle = 9 cm

Let the radius of 3rd circle be r.

Circumference of 1st circle = 2πr1 = 2π (19) = 38π

Circumference of 2nd circle = 2πr2 = 2π (9) = 18π

Circumference of 3rd circle = 2πr

Given that,

Circumference of 3rd circle = Circumference of 1st circle + Circumference of 2nd circle

2πr = 38π + 18π = 56π

Therefore, the radius of the circle which has circumference equal to the sum of the circumference of the given two circles is 28 cm.