Year 9 Interactive Maths - Second Edition

Using a Construction Line

Sometimes we need to draw a construction line (shown as a broken line) in the diagram to form a right-angled triangle.

Example 20

Use the information given in the diagram to find the value of x.

Solution:

Join BD by a broken line to form the right-angled triangles ABD and BCD.  Let BD = y cm.

Key Terms

construction line

Study Another Topic in Chapter 3: Pythagoras' Theorem

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