The area of a sector of a circle is ½ r² ∅, where r is the radius and ∅ the angle in radians subtended by the arc at the centre of the circle. So in the below diagram, the shaded area is equal to ½ r² ∅ . It’s actually 180 pi units2………..so the third option!!

Also, What is the area of the bigger circle?

AREA OF BIGGER CIRCLE = pi × r × r = 3.14 × 4 × 4 = 50.24cm^2. CONSIDERING SMALLER CIRCLE THE RADIUS IS 4/2 = 2cm. AREA OF SMALLER CIRCLE = pi × r × r = 3.14 × 2 × 2 = 12.56cm^2. HENCE THE AREA OF BIGGER CIRCLE — SMALLER CIRCLE IS 37.68 cm^2.

Similarly, What is the area of the shaded sector of the circle 9pi?

162 pi units^2.

Herein, What is the area of Fiona’s circle?

What is the area of Fiona’s circle? 7Pi meters squared.

What is the area of the shaded region? What is the area of the shaded region? The area of the shaded region is the difference between the areas of the rectangle and the square.

## What is the area of a 4 circle?

Answer: The area of the circle with a radius of 4 units is 16π sq.

## What is a formula of cylinder?

The formula for the volume of a cylinder is V=Bh or V=πr2h . The radius of the cylinder is 8 cm and the height is 15 cm. … Therefore, the volume of the cylinder is about 3016 cubic centimeters.

## What are all the formulas for a circle?

The fixed point is called the center of the circle. Radius is the distance from the center of a circle to the boundary of the circle.

List of All Circle Formulas.

Parameters Circle Formulas
Circumference of a circle formula C = 2 × π ×
Area of a circle formula A = π × r

2

## What is the sum of the areas of circle C and circle D?

The sum of areas of circle C and circle D is 98 square units, it is obtained from the attachment.

## What is the formula of area of sector?

Area of a Sector of Circle = (θ/360º) × πr2, where, θ is the angle subtended at the center, given in degrees, r is the radius of the circle. Area of a Sector of Circle = 1/2 × r2θ, where, θ is the angle subtended at the center, given in radians, r is the radius of the circle.

## What is the symbol for pi?

pi, in mathematics, the ratio of the circumference of a circle to its diameter. The symbol π was devised by British mathematician William Jones in 1706 to represent the ratio and was later popularized by Swiss mathematician Leonhard Euler.

## What is the sum of the areas of circle C and D?

The sum of areas of circle C and circle D is 98 square units, it is obtained from the attachment.

## What is the center of a circle represented by the equation?

The formula for the equation of a circle is (x – h)2+ (y – k)2 = r2, where (h, k) represents the coordinates of the center of the circle, and r represents the radius of the circle.

## What is the diameter of a circle 14 meters?

The diameter of a circle is the distance from one edge to the other, passing through the center. It is twice the radius.

Diameter of a Circle.

Diameter m

2
ft

2
14.0 m
153.9

1,657
14.1 m 156.1 1,681
14.2 m 158.4 1,705
14.3 m 160.6 1,729

0

## How do you find the circumference of a circle with a radius of 4?

Answer: The circumference of a circle with a radius of 4 is 8 π. The circumference of a circle is its boundary or the length of the complete one of a circle. Explanation: Calculate the circumference of a circle is by using the formula 2 π r, where r is the radius of the circle.

## Is a 4 inch circle?

The diameter of the circle is 6 inches. We can substitute this given information into our formula and solve for the circumference of the circle.

What’s the diameter of a 4 inch circle?

Size in Inches Circumference Inches Area in Square Inches
4 1/2 14.140 20.250
4 3/4 14.920 22.560

May 2, 2020

## What is surface area formula?

Surface area is the sum of the areas of all faces (or surfaces) on a 3D shape. … We can also label the length (l), width (w), and height (h) of the prism and use the formula, SA=2lw+2lh+2hw, to find the surface area.

## What is the π?

Succinctly, pi—which is written as the Greek letter for p, or π—is the ratio of the circumference of any circle to the diameter of that circle. Regardless of the circle’s size, this ratio will always equal pi. In decimal form, the value of pi is approximately 3.14.

## What are the 5 properties of a circle?

Circle Properties

• The circles are said to be congruent if they have equal radii.
• The diameter of a circle is the longest chord of a circle.
• Equal chords of a circle subtend equal angles at the centre.
• The radius drawn perpendicular to the chord bisects the chord.
• Circles having different radius are similar.

## How do you calculate a circle?

We use the circle formula to calculate the area, diameter, and circumference of a circle. The length between any point on the circle and its center is known as its radius.

Formulas Related to Circles.

Diameter of a Circle D = 2 × r
Circumference of a Circle C = 2 × π × r
Area of a Circle A = π × r

2

## How do you describe a circle shape?

A circle is a round shaped figure that has no corners or edges. In geometry, a circle can be defined as a closed, two-dimensional curved shape.

## What is the sum of the areas of circle C and circle D 7?

Assuming that the center of each circle is at point C and D, then both have a radius of 7cm. We know that the formula for solving area of the circle is A=pi*r². The answer is 98pi.

## What estimate is closest to the area of a circle with a radius of 4 cm?

What is the area of a circle with radius 4 cm?

Result: The area of a circle with radius 4 is 50.27
Formulae:
r = 4 d = 8 C = 25.1 A = πr

2

= π(d2)

2

A

= C

2

4π π = 3.1415 A = area C = circumference or perimeter r = radius, d = diameter