Question

Find the area enclosed between two concentric circles of radii 4cm and 4.5 cm
Give me the correct answer

Answer 1

Explanation:

The extended alternate side forms a triangle with the included side of the hexagon.

It's a equilateral triangle with side 2 cm.

So we have such 6 equilateral triangles in the star.

The area of the star shaped region = Area of hexagon + area of 6 equilateral triangles

= 2 x 6 x Area of one equilateral triangle,

= 12×(2)

2

×

4

3

=12

3

cm

2

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Answer 2

Answer:

area of circle = pi*r²

Explanation:

radius(r) =4c.m

radius(R) =4.5c.m

pi=3.14

area of circle with radius 'r'=pi*r²

area of circle with radius 'R'=pi*R²

remaining area =pi(R²-r²)

=3.14(8.5)(0.5)c.m²

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