Volume of a cone
Given the radius and h, the volume of a cone can be found by using the formula:
Formula: V_{cone} = 1/3 × b × h
b is the area of the base of the cone. Since the base is a circle, area of the base = pi × r^{2}
Thus, the formula is V_{cone} = 1/3 × pi × r^{2} × h
Use pi = 3.14
Example #1:
Calculate the volume if r = 2 cm and h = 3 cm
V_{cone} = 1/3 × 3.14 × 2^{2} × 3
V_{cone} = 1/3 × 3.14 × 4 × 3
V_{cone} = 1/3 × 3.14 × 12
V_{cone} = 1/3 × 37.68
V_{cone} = 1/3 × 37.68/1
V_{cone} = (1 × 37.68)/(3 × 1)
V_{cone} = 37.68/3
V_{cone} = 12.56 cm^{3}
Example #2:
Calculate the volume if r = 4 cm and h = 2 cm
V_{cone} = 1/3 × 3.14 × 4^{2} × 2
V_{cone} = 1/3 × 3.14 × 16 × 2
V_{cone} = 1/3 × 3.14 × 32
V_{cone} = 1/3 × 100.48
V_{cone} = 1/3 × 100.48/1
V_{cone} = (1 × 100.48)/(3 × 1)
V_{cone} = 100.48/3
V_{cone} = 33.49 cm^{3}
Fun game: Break spheres by matching balls with the same color
