Mathematics, 17.11.2019 19:31, xojade

A, b and d are points on the circumference of a circle centre o.
edc is a tangent to the circle.
angle bdc = 57°
find the size of angle aob.
you must give a reason for each stage of your working.

A, b and d are points on the circumference of a circle centre o. edc is a tangent to the circl

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A, b and d are points on the circumference of a circle centre o.
edc is a tangent to the circl...