exam Maths Puzzle Numerical Ability

The diameter of circle AOB is 12, Triangle ABC is inscribed in the circle, angle A = 45. In cm squared what is the area of Triangle ABC,
a) 18
b) 108
c) 144
d) 36
or e) 72

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exam Other Question

Solve by the substitution method. A rectangle has an area of (16p^2-40pr+25r^2)

Find the dimensions of the rectangle.