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Math-Test 4/25
Cirles, symmetry, perimeter
| Definition | Term |
|---|---|
| All points on a plane equidistant (the same distance) from a point called the center | Circle |
| Segment from the center of a circle to the outer part of the circle | Radius |
| Line segment with both end points on the outer part of the circle | Chord |
| Chord that goes through the center of a circle | Diameter |
| Part of the outer part of a circle | Arc |
| An arc that is less than a half-circle | Minor arc |
| An arc that is more than a half-circle (use 3 letters) | Major arc |
| "I can draw a line through the shape to fold in half and have two equal parts on both sides" | Reflection symmetry |
| "I can turn a shape a # of degrees and a number of times to make it look the same s it was before" | Rotational symmetry |
| "I can turn the shape upside down (180°) and have the shape look the same" | Point symmetry |
| Distance around a geometric figure | Perimeter |
| Perimeter formula for regular polygons | P=ns (n=# of sides) (s=length of side) |
| Perimeter formula for rectangles (2 ways of writing it) | P=2l+2w or P=2(l+w) |
| Perimeter formula for circles (perimeter of a circle=its circumference) | P=πd |
Created by:
km32002
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