EXER You will first do a few basic examples to revise Grade 11 work. Then you will use the double angle or compound angle identities to find the final answer or problems. ABCD is a building with a tower, DE, erected on top. The angle of elevation from A to E is 21° and the angle of elevation from B to E is 48°. If the height of the building is 30 m, calculate the height of the tower. 21 30 m ABDC is a field in the shape of a trapezium. 48° BD = DC Er and BDC 120° B C
EXER You will first do a few basic examples to revise Grade 11 work. Then you will use the double angle or compound angle identities to find the final answer or problems. ABCD is a building with a tower, DE, erected on top. The angle of elevation from A to E is 21° and the angle of elevation from B to E is 48°. If the height of the building is 30 m, calculate the height of the tower. 21 30 m ABDC is a field in the shape of a trapezium. 48° BD = DC Er and BDC 120° B C
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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Transcribed Image Text:ent
AQPS is therefore
20
90° - e
find a.
R
S.
-sin e
16
24 sin 0, which is simpler!
a
EXERCISE 1
for problems.
ABCD is a building with a tower, DE, erected
on top. The angle of elevation from A to E is
21° and the angle of elevation from B to E
is 48°. If the height of the building is 30 m,
calculate the height of the tower.
A.
21
30 m
2 ABDC is a field in the shape of a trapezium.
BD = DC = x and BDC = 120°.
48°
B
Show that BC = V3x.
22 If BC = 300 m, find the value of x.
23 Now calculate the value of  if
2.1
AB = 200 m.
24 Then calculate the area of the field.
30
120°
D
Unit
P
Jooh
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