Question

The diagram shows a wedge in the shape of a prism angle BCF is a right angle A string runs diagonally across the wedge from Ato F Calculate the length A F Give your answer correct to 3 significant figures

Answer 1

• 19.3 cm

Explanation:

Use Pythagorean theorem to calculate:

• BF = √11² + 5² = √121+25 = √146

Same method for FA, the diagonal of rectangle ABFE

• FA = √15² + 146 = √225+146 = √371 = 19.3 cm rounded up to 3 significant digits