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The sides of a parallelogram are 8 cm and 10 cm and the angle between them is 130°. Use cosine rule to calculate (a) the diagonals of the parallelogram. (b) angle DBC.

The sides of a parallelogram are 8 cm and 10 cm and the angle between them is 130°. Use cosine rule to calculate (a) the diagonals of the parallelogram. (b) angle DBC.

Trigonometry (11th Edition)
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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6 сm 7 cm G. F 8 cm 8 The sides of a parallelogram are 8 cm and 10 cm and the angle between them is 130° Use cosine rule to calculate (a) the diagonals of the parallelogram. (b) angle DBC. 9 One side of rhombus ABCD is 8 cm in length. If DAB=64°, find BD and AC. |3| ABCD is a rhombus. ABC =140°, and %3D AB=20 cm. Calculate (a) AC (b) ACB The hour hand of a clock is 3.2 cm long and the minute hand is 3.6 cm long Calculate the distance between their tip when the time is 5 o'clock. The sides of a triangle are 80 000 cm,
Transcribed Image Text:6 сm 7 cm G. F 8 cm 8 The sides of a parallelogram are 8 cm and 10 cm and the angle between them is 130° Use cosine rule to calculate (a) the diagonals of the parallelogram. (b) angle DBC. 9 One side of rhombus ABCD is 8 cm in length. If DAB=64°, find BD and AC. |3| ABCD is a rhombus. ABC =140°, and %3D AB=20 cm. Calculate (a) AC (b) ACB The hour hand of a clock is 3.2 cm long and the minute hand is 3.6 cm long Calculate the distance between their tip when the time is 5 o'clock. The sides of a triangle are 80 000 cm,
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