Circles Week of 326 Circles Radius The radius
- Slides: 23
Circles Week of 3/26
Circles Radius The radius of a circle is the distance from the center of the circle to the outside edge.
Circles � Diameter � The diameter of a circle is longest distance across a circle. (The diameter cuts through the center of the circle. This is what makes it the longest distance. )
What is the radius? r= d/2 r= 12/2 r=6 The radius is half the diameter!
What is the diameter? � d=2 r � d= 2(4. 5) � d=9 � The diameter is � 2 times the radius!
Circumference � The circumference of a circle is the distance around the outside of the circle. It could be called the perimeter of the circle.
Circumference given diameter �
Circumference given diamter
Circumference given radius: �
Circumference given radius
Videos and Practice https: //www. youtube. com/watch? v=vuo. Q 2 Cqg Ae. U � Work: Page 617 -618. Whatever you do not finish, is homework.
Day 2: Area of a Circle The space inside a circle is the Area of the circle. It can be found with the formula:
Area when given the radius. What is the area of a circle with radius of 3 m? Area =π × r 2 = π × 32 = π × (3 × 3) = 3. 14159. . . × 9 = 28. 27 m 2 (to 2 decimal places)
Area when given diameter
Area of a Semi- Circle Find the area and divide it by 2, because a semi circle is half of a circle.
Video and Practice � https: //www. youtube. com/watch? v=e. BAs. K 9 j. B 91 I � Work: Page 627 -628. Whatever you do not finish, is homework.
Day 3: review and problem solve Videos: https: //www. youtube. com/watch? v=c. C 0 f. Z_lk. F p. Q https: //www. youtube. com/watch? v=Ocaw. Byg 2 a. A https: //www. youtube. com/watch? v=Yb 1 HYy. Bf. L fc
Circumference and Area Play as a class: https: //jeopardylabs. com/play/circles-radiusdiameter-and-circumference Practice: Page 619 -620 Homework: Page 629 -630
Day 4: Cones and Cylinders
Day 4: Cones and Cylinders Cylinder � Formula or ◦ B = Area of the base ◦ h = Height ◦ r = Radius ◦ = Pi = 3. 14159…. . (irrational number use calculator unless told otherwise)
Volume of Cylinders Class Practice 18 cm 5 cm
Cone � Formula 10 cm 6 cm
Day 5: Quiz Day � Use your packet of notes to complete the quiz.
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