6. Draw a circle of radius 3 cm with A as centre. Take
point B on the circle. Now with B as centre, radius
equal to 3 cm, draw another circle. Does this circle
pass through the point A?
Now let C and D be two points. Where does these
two circles intersect?
Are AB and CD perpendicular?
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Al-Idrisi is best known in the West as a geographer, who made a globe of silver sphere weighing 400 kilograms for King Roger II of Sicily. Some scholars regard him as the greatest geographer and cartographer of the Middle Ages. He also made original contributions in medicinal plants.
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