Circles
Describe/show how the radius AND diameter are represented in a circle.
Radius - starts from the center to a point on a circle.
Diameter - extends from one side of the circle to the other, passing through the center.
Evaluate 2 + (-8).
-6
Convert 0.43 to a fraction.
43/100
What are the number of terms?
Is this an expression or equation?
2x+3=x-5
4 terms
equation
Solve the equation.
-5x = -15
x = 3
Demonstrate what the diameter of a circle would be, if the radius was 5cm.
Radius is half of diameter, OR diameter is twice the radius. Therefore, the diameter would be 10cm.
Evaluate -5 - 7.
-12
Evaluate (-2 1/7) + 5/7.
-10/7 = -1 3/7
Simplify the following expression.
4x - 6 - 5x - 2
- x - 8
Solve 3y-8=4.
y = 4
Describe what circumference AND area are.
What are the area and circumference equations (formulas) of a circle?
Circumference is the distance around a circle (perimeter).
Circumference = pi times diameter OR
Circumference = pi times 2 times radius
Area is the region (space) occupied in a circle.
Area = pi times radius squared
A) What's a positive times a negative?
5(-3)
B) What's a negative divided by a negative?
-28 / (-7)
A) (pos)(neg)=neg
5(-3) = -15
B) (neg) / (neg)=pos
-28/(-7) = 4
Evaluate (-3/5) divided by (-2/3).
9/10
Simplify (-6x-4) + (-2x+9) .
- 8x + 5
Solve m/2 + 3= 10.
m = 14
What is the circumference AND area of a circle with a radius of 6 inches?
Circumference = 2 times pi times radius = 37.68 in
Area = pi times radius squared 113.04 in^2
A) Evaluate 6 - (-4).
B) Evaluate |-25|.
A) 10
B) 25
Evaluate (-2/3) - 1/5.
-13/15
Simplify (-4x+3)-(7x-9).
- 11x - 6
Solve -2(r-4)=6.
r = 1
What is the area AND circumference of a circle with a diameter of 24cm?
Area = (pi)(12)^2 = 452.16 cm^2
Circumference = (pi)(24) = 75.36cm
Evaluate 4(-6) divided by 8 + 3^3 using the order of operations.
(Rewrite on the board)
24
Evaluate xy when x=(-3/5) and y=(-2.4).
72/50 = 1 22/50 = 1 11/25
Simplify 5 + (-4x+2)7.
5 - 28x + 14 is simplified to 9 - 28x
Last week Ezekiel ran 20 miles more than Koa. Ezekiel ran 55 miles. How many miles did Koa run?