The point $(p,9)$ lies on line $k$ shown here. What is the value of $p$?
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Answer:
From the basics of algebra,
a triangle subtended to the center of a circle from the circumference is always isosceles
since the Central angle is 60 and the triangle is isosceles, the other angles are,
meaning that the triangle is equilateral.
all the other angles are 60.
the radius of the circle is the length of the triangles side,
ie 6cm