Circles.

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Presentation transcript:

Circles

Parts of a Circle Center

Parts of a Circle Diameter (must go through the center)

Parts of a Circle Radius (half a diameter – from the outside to the center)

Parts of a Circle Sector (like a slice of pizza)

Parts of a Circle Chord (a line that crosses the circle but not through the center)

Parts of a Circle Segment (looks a bit like an orange segment)

Parts of a Circle Circumference (the perimeter of the circle)

Parts of a Circle Arc (part of the circumference)

Parts of a Circle Tangent (a line that touches the circle at a single point on the circumference

Parts of a Circle Semicircle (half a circle)

What is this? Radius

What is this? Semicircle

What is this? Center

What is this? Diameter

What is this? Chord

What is this? Sector

What is this? Circumference

What is this? Segment

What is this? Tangent

What is this? Diameter

What is this? Sector

What is this? Semicircle

What is this? Segment

What is this? Chord

What is this? Tangent

What is this? Arc

Homework: Learn these words (meanings & spellings)

Parts of a Circle

The Parts of a Circle Write the names of the parts of the circle next to their definition. A line that crosses a circle, passing through the centre. A part of the circumference of the circle A part of a circle formed by two radii and an arc. A part of a circle formed by a chord and an arc.

The Parts of a Circle Write the names of the parts of the circle next to their definition. A line from the centre of the circle to a point on the circumference. The distance around the outside of the circle. A line that touches the circumference at one point only. It meets the radius at right angles. A line that joins two points on the circumference of a circle.