Surface Area Of A Pencil
What is the approximate area of this pencil ...? 3
(Use 3.14 for PIE. Round your answer to the nearest number).
(The cylinder that makes the pencil is 15 cm long, while the tip of the cone that makes the tip of the pencil measures d = 0.6 cm and the tip of the pencil measures s = 2 cm.)
H.28 cm square
B) 41 cm square
H. 30 cm square
D) 70 cm square
The radius of the cone above the pencil is r = 0.6 cm / 2 = 0.3 cm and height s = 2 cm.
Upper surface of cone = Â € r s = Â € (0.3) (2) = 0.6 Â € cm 2
The radius of the cylindrical part of the pencil is r = 0.3 cm and height h = 15 cm
Area of cylindrical segment = € 2 r h = € 2 (0.3) (15) = € 9 cm 2
Below the pencil is a circle with radius r = 0.3 cm.
Pencil background = Â € r 2 = 0.09 Â € cm 2
Total area = (€ 0.6 + € 9 + 0.09) cm 2 = € 9.69 cm 2 = 30.4266 cm 2
Answer: C) 30 cm;
