2026 CSS P1 Q12

2026 CSS P1 Q12

Secondary 4
3 marks

The circular arc \(BC\) is part of a circle centre \(A\).

The centre of semicircle \(ACD\) is \(O\).

The diameter of the semicircle, \(AC\) is \(13\text{ cm}\).

\(\angle BAC=0.96\) radians.

  1. Show that the arc length \(BC\) is \(12.48\text{ cm}\).[1]
  2. Find the perimeter of \(ABCD\).[2]

Solution:

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Answer:(a) \(12.48\text{ cm}\) (shown) (b) \(45.9\text{ cm}\)

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