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Question 1 Rajah di bawah menunjukkan sekeping kad, ABC berbentuk segitiga yang dihasilkan oleh Serina. Dia melukis sebuah bulatan berpusat O di dalam segitiga sama

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Question 1 Rajah di bawah menunjukkan sekeping kad, ABC berbentuk segitiga yang dihasilkan oleh Serina. Dia melukis sebuah bulatan berpusat O di dalam segitiga sama Sisi tersebut. Kesemua Sisi segitiga merupakan tangen kepada bulatan. Diagram below shows a triangular card, ABC made by Serina. She draws a circle with centre O inside the equilateral triangle. All sides of the triangle are tangent to the circle. Diberi bahawa panjang Sisi segitiga itu ialah 24 cm. Given that the length of sides of the triangle is 24 cm Hitung Calculate (a) panjang, dalam cm, jejari bulatan, [2 markah] the radius, in cm, of the circle, [2 marks] (b ) luas, dalam cm, bagi kawasan berlorek, [4 markah] the area in cm, of the shaded region, [4 marks] (c) baki reben yang tinggal jika Serina mempunyai reben sebanyak I meter untuk diletakkan di sekeliling bahagian kad yang berlorek. [4 markah] the remaining ribbon if Serina has a 1 metre ribbon to be placed around the shaded part of the card. [4 marks]

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