math

circles

by: aya

i got my lager from circumference too much π

INDEX

diameter

circle

radius

circumference

area

chord

circle

1. Is a round shaped figure that has no corners or edges.
2. In geometry, a circle can be defined as a closed, two-dimensional curved shape.
3. Crcles are the only figures that have an infinite amount of lines of symmetry. A circle has the shortest perimeter of all shapes with the same area.
4. Two circles are congruent if they have a congruent radi.
5. Concentric circles are coplanar circles that have the same center.
6. Arc: refers to a portion of a circle. (x/ 360 ×2πr)

- The full arc of a circle measures 360 degrees. - Minor arc: is the shortest arc connecting two endpoints on a circle. -has a measure between 0° and 180°. - Major arc: is the longest arc connecting two endpoints on a circle. -has a measure between 180° and 360°. - Semicircle: is an arc with endpoints that lie on a diameter. -has a measure of 180°.

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AD and CG are diameters of ⊙B . Identify eacha rc as a major arc, minor arc, or semicircle. Then find its measure

mCD

-it's a minor arc, mCD= m∠CBD =55

Parts Of Circle

Radius

Diameter

Chord

23Is the distance from the center of a circle to any point on the circumference of the circle.

A line segment whose endpoints are on a circle.

A chord that passes through the center of the circle.

Vitae curabitur or nare eget commodo.

r= d/2

d= 2r

Ornare eget commodo accumsan suscipit.

+ info

what is the Radius Chord and Diameter

Radius = QP, QR and QS Chord = PS and PR Diameter = PR

come on, ED!you've got to see things form another angle...

Area

Circumference

1. Is its boundary or the length of the complete one of a circle.

1. Is the area enclosed by a circle of radius r is πr².

A=πr2 A = (π/4) × D2 A = C2 / 4π

C=2πr

(when you know the Diameter) (when you know the Circumference)

The rotation of the wheel cart has a circumference of 220 inches. Find its radius.

Circumference of wheel =220 inch 2πr= 220 2×π×r= 220 r=220×7/22×2 r=35

The holes are 0.4 m wide and 1 m deep, how much concrete should Max order for each hole?

The diameter is 0.4m, so the Area is: A = (π/4) × D^2 A = (3.14159/4) × 0.42 A = 0.7854 × 0.16 A = 0.126 m^2

thank you

thank you