Example: What is the area of a circle whose diameter is 10 cm? Given: Diameter(d) = 10cm;
So, Radius(r) = Diameter/2 = 10/2 = 5cm Area of a circle: πr2 = π x 52 = π x 25 = 25π sq cm
Grades:
7-12
Example:
14
x 5
70
Grades:
3
4
Example: 23 is equal to 3 x 3
TRUE
FALSE
Grades:
6
7-12
Example: I am round and you put it on your finger. What shape am I?
circle
Grades:
1
2
3
Example: I am made of a vertical and a horizontal line. Who am I?