What is the area of 4 cm radius?
What is the area of 4 cm radius?
The area of a circle is equal to Pi π times the radius r squared. Substitute in the value of the radius r=4 into the formula for the area of a circle. Pi π is approximately equal to 3.14 . Raise 4 to the power of 2 .
What is the circumference of radius 4 cm?
8π
The circumference is 8πcm or 25.12cm .
What is the diameter 4 cm?
The radius is the distance from the center of the circle to its edge. If the radius of the circle is 4 cm, then the diameter of the circle is 4 cm x 2, or 8 cm. If you know the circumference of the circle, divide it by π to get the diameter.
How do you draw a circle with a radius of 4 cm?
Draw a line segment 4 cm.
- ii. Take a point P outside the circle and draw a secant PAB, intersecting the circle at A and B.
- iii. Produce AP to C such that AP = CP.
- iv. Draw a semi-circle with CB as diameter.
- v. Draw PD perpendicular to CB, intersecting the semi-circle at D.
- vi.
- vii.
- viii.
How wide is 4 cm in inches?
Centimeters to inches conversion table
| Centimeters (cm) | Inches (“) (decimal) | Inches (“) (fraction) |
|---|---|---|
| 4 cm | 1.5748 in | 1 37/64 in |
| 5 cm | 1.9685 in | 1 31/32 in |
| 6 cm | 2.3622 in | 2 23/64 in |
| 7 cm | 2.7559 in | 2 3/4 in |
What is a 4 inch circumference?
c=πd. Where c is the circumference, π is a number and its approximate value is 3.14 and d is its diameter. ⇒c=π4=3.14⋅4=12.56 inches.
What is the circumference with a radius of 3?
The formula for finding the circumference is 2πr . We can plug in 3 for r, getting 2π3 .
What is the circumference for 4?
Answer: The circumference of a circle with a radius of 4 is 8 π.
What is the diameter of a circle with a circumference of 11 304 units?
therefore, diameter of the circle = 1798 x 2 = 3596 units……
How do you solve for radius?
radius is always half the length of its diameter. For example, if the diameter is 4 cm, the radius equals 4 cm ÷ 2 = 2 cm.
How do you draw a circle with a radius of 3cm?
Step 1: Draw a circle with centre O and radius 3 cm using a compass.
- Step 2: Draw a secant passing through the centre.
- Step 3: Place the compass on P and draw two arcs on opposite sides of OP.
- Step 6: Mark the intersection points of the circle drawn from M1 with the circle drawn from O as A and B.
What is the area of a circle with diameter 4.5 cm?
A circle of radius = 2.25 or diameter = 4.5 or circumference = 14.14 cm has an area of: 1.59 × 10 -9 square kilometers (km²) 0.00159 square meters (m²) 15.9 square centimeters (cm²)
Is the radius of a circle the same as the diameter?
The radius is the distance between the centre and any point on the outer edge of a circle. Diameter of Circle This is the diameter of a circle that corresponds to the specified radius.
How to calculate the size of a circle?
1 The diameter – defined above 2 The radius – the distance from the circle’s center or origin to the edge, one half the diameter 3 The circumference – the length of the outside boundaries of the circle
How big is a circle in feet and inches?
For example, if the diameter is 16 feet, then the radius is 16 / 2 = 8 feet. The circumference is therefore 2 x 3.14159 x 8 = 50.26 feet. Circles are often used by architects for athletic tracks, recreational areas, buildings, and roundabouts.