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SubjectPaid lesson

Mensuration of Solid Shapes (III)

ClassNotes Team 6 MIN READUPDATED 18 JUN 2026

Mathematics SSS 1 Second Term

WEEK 8

Mensuration of Solid Shapes (III)

Performance Objectives

Students should be able to;

  1. Find the total surface area of Frustum
  2. Find the total surface area of cone
  3. Calculate the total surface area of Pyramids

Total Surface Area of Frustum, Cone and Pyramid

Content

A frustum is the remaining part of cone or pyramid when the top part is cut off as shown below. Daily examples of frustums are buckets, lamps shades e.t.c.

Mensuration of Solid Shapes (III)

Frustum of a cone

Mensuration of Solid Shapes (III)

For Surface area of the frustum of a pyramid, we sum up all areas of the faces that make up the frustum.

For Surface area of the frustum of a cone,

Total surface area of a Closed frustum…