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Area = pi*r2

Area = pi(4.2)2

= 55 units2

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Q: How do you find the area of a circle if its radius is 4.2?

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If the radius is 42 meters, then you already know the radius.

The area of a circle is pi times the square of the radius: A = πr2. For a circle of radius 4, this is π x 42 = π x 16 = 50.265 units squared.A circle with a radius of 4 units has an area of 50.27 square units.

The radius of a circle if its circumference is 42 is about 6.68

A circle with a radius of 21 yards has an area of 1,385.44 square yards.

Area = pi*42 = 50.26548246 or about 50 square cm

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If the radius is 42 meters, then you already know the radius.

Area of a circle = pi x (radius)2So, if the radius is 4 cm, the area is pi x 42= 50.265 cm2

The radius of a circle if its circumference is 42 is about 6.68

The area of a circle is pi times the square of the radius: A = πr2. For a circle of radius 4, this is π x 42 = π x 16 = 50.265 units squared.A circle with a radius of 4 units has an area of 50.27 square units.

A circle with a radius of 21 yards has an area of 1,385.44 square yards.

The radius of a circle with a circumference of 42 meters is about 6.685 meters.

Area = pi*42 = 50.26548246 or about 50 square cm

A circle with a radius of 42 feet has a circumference of 263.89 feet.

Area = pi*422 = 5541.769 sq inches to 3 d.p.

50.2656 square inches The formula to find the area of a circle is ∏r2. Where ∏ is the mathematical constant and r is the radius of the circle. So 3.14 x 42. = 50.27 square cm or yds, (whatever the diameter was in).

PIE r squared 3.142 X 42 = 50.24

It is: pi*42 = 50.265 square feet to 3 dp