Question

Find the value of x? AB=15 cm, AC=42 cm, BC=?

Answer 1

Answer:

Let BC be x

AB=15cm

AC=42cm

then

BC^2=AC^2-AB^2

BC^2=(42)^2-(15)^2

BC^2=1764-225

BC=√1539

BC=√39.2×39.2

BC=39.2