Mathematics · Oct / Nov 2021 · Paper 41 · Question 5

62 and Angle at centre is twice angle at circumference oe [2]

B1 for either

117 and Isosceles [triangle] and Opposite angles in a cyclic quadrilateral are supplementary [4]

B2 for 117

or B1 for [angle OCD =] 28 B1dep for isosceles [triangle] and

B1 for opposite angles in a cyclic quadrilateral are supplementary

24.9 or 24.94 to 24.95 [5]

B1 for angle PQS = 42

M2 for QS = 5.9 ÷ cos 42 oe

or M1 for cos42= 5.9 QS oe M1dep for their SQ × π oe