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In figure, Which line is diameter?
AB
Find circumference of a circle with radius 10 cm. (take π = 3.14)
62.8 cm
Find perimeter of a semicircle with diameter 2 cm.(Take π = 3.14)
Perimeter = (1/2 x 3.14 x d ) + d
=(1/2 x 3.14 x 2) + 2
= 3.14 + 2 = 5.14 cm
Find area of a circle with radius 7 cm. (take π = 22/7)
Area = 22/7 x r x r = 22/7 x 7 x 7 = 154 cm²
Find a perimeter of a quadrant with diameter 4 cm. (take π = 3.14)
Perimeter = (1/4 x 3.14 x d ) + d = (1/4 x 3.14 x 4) + 4 = 3.14 + 4 = 7.14 cm
If radius = 4 cm, so diameter = ... cm
2 x 4 cm = 8 cm
If diameter = 28 cm, so radius = ... cm
28 : 2 = 14 cm
Radius a quadrant is 7 cm. (Take π = 22/7) Perimeter = ... cm
(1/4 x 22/7 x 2 x 7) + 7 + 7 = 25 cm
Radius = 7 cm. (Take π = 22/7) Circumference of a circle = ... cm
Circumference = 22/7 x 2 x r = 22/7 x 2 x 7 = 44 cm
Radius = 10 cm. (Take π = 3.14) Area of a circle = ... cm².
Area = 3.14 x r x r = 3.14 x 10 x 10 = 314
Area of a circle with diameter 28 cm is ... cm².(Take π = 22/7)
Radius = 28 : 2 = 14
Area = 22/7 x 14 x 14 = 616 cm²
Diameter = 14 cm. (Take π = 22/7). Circumference of a circle = ... cm.
Circumference = 22/7 x 14 = 44 cm.
Diameter = 49 cm. Circumference of a circle = ... cm.
Circumference = 22/7 x d = 22/7 x 49 = 154 cm.
A diameter cuts a circle into ... semicircles.
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