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5th Grade Miss Cameron’s ClassCIRCUMFERENCE 5th Grade Miss Cameron’s Class
The circumference of a circle isThe distance around a circle Hint: Circumference remember circle around. Circumference is a circle’s perimeter.
The diameter is the distance across a circle through the center.
Hint: It is ½ the diameterVocabulary. The radius is the distance from the center of a circle to any point on a circle. Hint: It is ½ the diameter
We use Pi as the measurement to help us find the circumference of a circle.Pi, not Pie!
Two formulas are used in finding the circumference of a circle.WHEN THE CIRCLE HAS A DIAMETER MEASUREMENT, USE THE FOLLOWING FORMULA. Circumference = d 4in. 3.14 x 4in. 12.6in.
HINT: You may round to the nearest tenthWhen the radius of a circle is given, the following formula should be used. Circumference = 2r 2 x 5cm x 3.14 31.4cm HINT: You may round to the nearest tenth
Tell me what formula would be used to solve the next five problems.NOW…Let’s have some fun. Tell me what formula would be used to solve the next five problems.
3in C = 2 x r x 3.14
8ft C = 3.14 d
122mm C = 2 x r x 3.14
17.5 cm C = 3.14 x d
122.5mm C = 2 x r x 3.14
Now that we have determined the correct formula for each, let’s work the problems.
The answer is: 18.8in 3in C = 2 x 3.14 x r
8ft C = 3.14 d The answer is: 25.1ft
122mm C = 2 x 3.14 x d The answer is: mm
17.5 cm C = 3.14 x d The answer is: 55cm
122.5mm C = 2 x 3.14 x r The answer is: 76,930mm
The amount of space inside.Area of a circle= The amount of space inside. r ² 6 m
Another formula ½ d x 12 ft
Find area 9 ft
Find area 15 mm
Find area 13 cm
Find area 19 ft
Circles rap Circles, those tricky circles! Pow! I said those circles.By Miss Cameron Circles, those tricky circles! Pow! I said those circles. Those tricky circles! Pow!
Circumference is perimeter; it’s all the sameThey just try to trick you with a name game. Circumference is diameter, the length across Multiplied by pi So don’t get lost
Rap with me now, & please don’t slumber. Pi is 3.14, a funny number. Rap with me now, & please don’t slumber. Area for a circle is radius squared. So half the diameter and make it squared.
Well you know what to do, so do it now. Find circumference and area of a circle. POW! Circles, those tricky circles. POW! I said those circles, those tricky circles. POW!
SPI: Calculate with circumferences and areas of circles.
Prime Time Circle the seven prime numbers that, when added together, equal 75. 3, 11, 14, 13, 5, 17, 12, 6, 19, 23, 7, 9 Remember a prime number is a number.
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