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: Which of these numbers have 20 as the place value of the digit 2?
62
23
29
Grades:
2
Example: I three sides and three edges. Who am I?
triangle
Grades:
3
4
5
Example: Lucy had 1 blue, 3 green and 4 red pens. What type of a ratio is 3:4??