79): Find the area of the sector of the circle. Radius: 2.5 feet. Central Angle: 225 degrees.
I multiplied (1/2)(25/4)(5pi/4), and I got 100pi/16, which reduced to 50pi/8 when I halved it. I reduced that to 25pi/4 or 19.63. But the book's answer is 12.27. How'd I mess up?
 👍
 👎
 👁
 ℹ️
 🚩
2 answers

Area of sector of a circle with radius r for sector given in degrees (theta):
A = (1/2)(r^2)(theta)((pi)/(180) 👍
 👎
 ℹ️
 🚩

Left off the trailing parenthesis...
Area of sector of a circle with radius r for sector given in degrees (theta):
A = (1/2)(r^2)(theta)((pi)/(180)) 👍
 👎
 ℹ️
 🚩
Answer this Question
Related Questions

Math
The area of a circle is found with the formula A= 3.14r2 where 3.14 represents 3.14. If a tile artist is placing tiles in a circular mosaic pattern and the area of the circle is 658 square feet what is the approximate radius of the circle in feet?

math
The area of a circle is found with the formula A =〖πr〗^2, where π represents 3.14. If a tile artist is placing tiles in a circular mosaic pattern and the area of the circle is 658 square feet, what is the approximate radius of the circle in feet?

math
An arc AB of length 5cm is marked an a circle of radius 3cm. Find the area of the sector bounded by this arc and the radii from A and B.

Math
Find the radius of the circle if an arc of length 5 ft on the circle subtends a central angle of 135°. (Round your answer to two decimal places.)

trigonometry
Find the radius of a circle on which a central angle of 3 pie over 2 radians subtends an arc of 60 ft.

Maths
A sector of a circle of radius 7cm subtending an angle of 270 degree at centre of the circle is use to form a cone? (A)find the base radius of the cone. (B)calculate the area of the base of the cone.

precalc
Find an angle between 0 and 2ð that is coterminal with the given angle. 8pi/3 A sector of a circle has a central angle of 60°. Find the area of the sector if the radius of the circle is 3 mi.

Math
For any circle, which ratio is equal to the number π? Select all that apply. ***A. Circumference  Diameter B. Circumference  Radius ***C. Circumference  2 Times Radius D. Radius Squared

math
a circular pizza box logo has a sector with a central angle of 80 degrees and a diameter of 16 inches. Find the area of this sector

Mathematics
A sector of radius 7cm substending an angle 210 at the center of the circle, is used to form a cone calculate to the nearest whole number,the base radius of the cone,the height of the cone, the total surface arc of the cone, volume of the cone, vertical

Math
A sector of radius 14 cm subtend an angle of 240 degree at the center of the circle is bent to form a cone calculate the base radius of the cone

geometry
11. Infinitely many different sectors can be cut from a circular piece of paper with a 12cm radius, and any such sector can be fashioned into a paper cone with a 12cm slant height. (a) Show that the volume of the cone produced by the 180degree sector is

algebra
of radius 54 meters subtended by the central angle 1/9 radian. s(arc length = meters How is the answer 6? s denotes the lenght of the arc of a circle of radius r subtended by the central angle 0. Find the missing quantity. The radius r of the circle is ?

Math
Circumference and Area of a Circle Quiz Part 1 1) Find the Area of the parallelogram (1pt) base:67 hight:52 A)3,302 ft2 B)3,484 ft2****** C)3,752 D)4,020 2)Find the Area of the triangle (1pt) base:2.8cm hight:7.8cm A)21.84 cm2 B)21.2cm2 C)10.92 cm2******

Math HELP
There is a triangle inside of a circle. I have to find area of the shaded region which is the circle. So i would have to substract the area of the triangle from the area of the circle. the radius of the circle is 3 inches. I found the area of the

mathematics
a sector with an angle 110 degree at the centre of a circle is cut away from a circular piece of paper of radius 70cm,the remaining part is folded to form a cone, find: a:vertical angle of the cone b:angle of the sector

MATH please help
A circle with radius 16 centimeters is inscribed in a square and it showes a circle inside a square and a dot inside the circle that shows 16 ft inbetween Which is the area of the shaded region A 804.25 square feet B 1024 square feet C 822.94 square feet D

math
Find the volume of the cone to be constructed from a sector having a diameter of 72 cm and a central angle of 210

Algebra
what is the length of a radius of a circle with a central angle of 3π/5 and an arc length of 24π/5 The length of a radius of the circle is units.

math
A sector of a circle subtending an angle 300 degrees at the centre is used to form a cone with base radius 6cm. Find the (a.)radius of the circle (b.)volume of the cone (c.)area of the minor sector of the circle
Still need help?
You can ask a new question or browse existing questions.