PLEASE HELP ABCD is a trapezium. Angle ADC = Angle BCD = 90. Angle BAD = 58. AB = 4.7cm and BC = 7.3cm. a) Show that AD = 9.8cm correct to 1 decimal place. b) Find the size of Angle ACB?
1 Answer
Nov 17, 2017
see below
Explanation:
Note from the diagram that length AD is AP + PD. We know the length PD, this is the same as BC.
Finding length AP.
So length of AD:
Angle ACB
First we need to find the length of AC. We can do this by finding the length CD. This is the same length as PB:
Length PB:
Now we know all the sides of triangle ABC, we can use the Cosine Rule to find angle ACB.