ABC26GN4760 · Volume and Surface Area
Subject: General Aptitude · Chapter: Volume and Surface Area · Exam: · Marks: · Difficulty:
Find the slant height, volume, curved surface area and the whole surface area of a cone of radius 21 cm and height 28 cm.
Answer
Explanation
Here, r = 21 cm and h = 28 cm. ∴ Slant height, l = r 2 + h2 = (21)2 + (28)2 = 1225 = 35 cm. 1 2 1 22 Volume = πr h = × × 21 × 21 × 28 cm 3 = 12936 cm 3 . 3 3 7 22 Curved surface area = πrl = × 21 × 35 cm 2 = 2310 cm 2 . 7 2 22 Total surface area = (πrl + πr ) = 2310 + × 21 × 21 cm 2 = 3696 cm 2 . 7
Explanation as extracted from the printed page; notation may be imperfect.
Open in whiteboard · Browse this chapter in the app