Mathematics 4024 · O Level · Non-right-angled triangles

Non-right-angled triangles — practice question

The diagram depicts a pentagon.
(a)[2]

Calculate the interior angle $B$ inside the polygon.

(b)[5]

Inside the pentagon, $AE = 8$ cm and $AD = 15$ cm. Calculate the length $ED$. Show your working and present your answer to $1$ decimal place.

Worked solution & mark scheme

This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Uses the fact that the angles in a polygon add to $360$” …

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