The diagram shows a shape made from an equilateral triangle $$\(A B C\)$$ and a sector of a circle. Points $$\(B\)$$ and $$\(C\)$$ lie on the circle, centre $$\(A\)$$. The side length of the equilateral triangle is $$\(12.4 \mathrm{~cm}\)$$. Work out the perimeter of the shape. ........................................ $$\(\mathrm{cm}\)$$
Exam No：0580_s21_qp_22 Year：2021 Question No：19(a)
Answer:
\(77.3\) or \(77.32\) to \(77.33 \ldots\)
Knowledge points:
E5.3.1 Carry out calculations involving the circumference and area of a circle. (Answers may be asked for in multiples of π.)
E5.3.2 Solve problems involving the arc length and sector area as fractions of the circumference and area of a circle.
Solution:
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