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ABCD is a trapezium BC 6cm AB 8.5 cm Height 7.5 cm AD 21 cm Work out the size of angle CDA, giving your answer to 1 decimal place. So I've been struggling on this and I need help quick, cheers​



Answer :

toroongch16
1. Divide the trapezium so you have a right-angled triangle. The height should be 7.5, and I’m assuming CD=8.5.
2. Using Soh Cah Toa, you’d know that you will have to use Soh because there is info for opposite side and the hypothenuse.
3. sin(CDA)= 7.5/8.5
4. CDA= sin-1(7.5/8.5)
5. CDA= 61.9