25. E D Fig. 4 (a) In Fig. 4, AABC has an inscribed unit circle. AB=AC, AD BC. E is the centre of the circle. BE bisects ZABC. Let AD = h and BD = r. By using the formula of tan 20, or 2² otherwise, prove that h = Hence deduce that r² = 2 ²-1 h h-2 (b) A circular cone, with base radius r and height h, has an inscribed unit sphere. Find the volume of the
25. E D Fig. 4 (a) In Fig. 4, AABC has an inscribed unit circle. AB=AC, AD BC. E is the centre of the circle. BE bisects ZABC. Let AD = h and BD = r. By using the formula of tan 20, or 2² otherwise, prove that h = Hence deduce that r² = 2 ²-1 h h-2 (b) A circular cone, with base radius r and height h, has an inscribed unit sphere. Find the volume of the
Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE:
1. Give the measures of the complement and the supplement of an angle measuring 35°.
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