Eight circles of radius 1 have centers on a larger common circle, and adjacent circles are tangent. Find the area of the common circle.

THE AREA OF COMMON CIRCLE IS 2 ( 2 + √ 2 ).

Step-by-step explanation:

As given in the information let us consider eight small circles each having radius 1 and are adjacent to each other

These adjacent circles are tangent to each other.

These 8 small circles form together a big circle which is having radius 'R' to small circles.

Let us consider the angle between big circle and small circle is .

= for one circle

As we are having eight circles angle for eight circles is

= /8

Radius R = 1 / sin

cos 2 = 1 - 2sin² => sin 2 = (1- cos2)/2 and with cos   /8 = 1/2 * √ 2

we get 1/sin   /8  = 4/(2- √ 2)

Therefore area of common circle is

=> 2(2+√ 2).

answer: 10 turtles

step-by-step explanation: as turtles have four legs so 4.10=40 therefore birds are 4 which sue counted

180-142=38 for the acute angle next to the entry

90+38=128

180-128=52

a=52

step-by-step explanation: