#further maths
radiant ibex
i dont understand what how to prove thats the diameter
the circus theorem with the right angled triangle
u need to use that
cause that one only applies if it goes through the diameter
gloomy onyx
opposite angles in a cyclic quadrilateral
add up to 180
10x=180
x=18
4x=72 x=18
therefore those 2 angles add up to 90
angles in a triangle add up to 180
so 180-90 =90
CBA is right angle
angles subtended by the circumference and a diameter is 90 degress
at circumference and 90 degrees so it is diameter
@viscid wren