Question

the difference of circumference and diameter of circle is 16.8 . find Area of circle ​

Answer 1

ANSWER:

• Area of circle = 47.76 sq. units.

DIAGRAM:

$\setlength{\unitlength}{1 cm}\begin{picture}(0,0) \thicklines\put(0,0){\circle{4}} \put( - 0.1,0){ \vector(1,0){0.65}}\put(0.2,0.1){ \huge{\bold{ r}} }\put(0,0){\circle*{0.1}}\end{picture}$

GIVEN:

• Difference of circumference and diameter of circle is 16.8 units.

TO FIND:

• Area of the circle.

EXPLANATION:

Circumference of circle is = 2 π r units.

Diameter of circle = 2r units.

Circumference - Diameter = 2 π r - 2r

Circumference - Diameter = 2r(π - 1)

Circumference - Diameter = 2r(3.14 - 1)

Circumference - Diameter = 2r(2.14)

2r(2.14) = 16.8

2r = 7.85

r = 3.9 units

Area of circle = πr² sq. units.

Area of circle = 3.14(3.9)² sq. units.

Area of circle = 3.14(15.21) sq. units.

Area of circle = 47.76 sq. units.

SOME MORE FORMUALE:

• Volume of sphere = 4/3 πr³ cu. units.

• Volume of hemisphere = 2/3 πr³ cu. units.

• C.S.A of sphere = 4 πr² sq. units.

• C.S.A of hemisphere = 2 πr² sq. units.

• T.S.A of hemisphere = 3 πr² sq. units.

• Volume of cylinder = πr²h cu. units.

• Volume of cone = 1/3 πr²h cu. units.

• C.S.A of cone = πrl sq. units.

• C.S.A of cylinder = πr² h sq. units.

• T.S.A of cone = πr(l +r) sq. units.

• T.S.A of cylinder = 2πr(h + r) sq. units.

★ T.S.A - Total Surface Area.

★ C.S.A - Curved Surface Area.

★ Sq. units - Square units.

★ Cu. units - Cubic units.

Answer 2

Answer:

I hope it's help you

mark as brainlist answer please