The diagram shows a trapezium $$\(A B C D\)$$ in which $$\(A D=B C=r\)$$ and $$\(A B=2 r\)$$. The acute angles $$\(B A D\)$$ and $$\(A B C\)$$ are both equal to $$\(x\)$$ radians. Circular arcs of radius $$\(r\)$$ with centres $$\(A\)$$ and $$\(B\)$$ meet at $$\(M\)$$, the midpoint of $$\(A B\)$$. Verify by calculation that $$\(x\)$$ lies between $$\(0.5\)$$ and $$\(0.7\)$$. ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................

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