Question

Find the length of BC.

Answer 1

Answer: 10.25

Explanation:

Use Pythagoras equation:

AB=√AD²+BD²

AB=√5²+4²

AB=√25+16

AB=√41

cos∡ABC=AB/BC=BD/AB

AB/BC=BD/AB

AB²=BC*BD

(√41)²=BC*4

41/4=BC

BC=10.25