CBSE Class 10 Maths (Standard) 2016 · Paper 30/2/1 · Question 1

Circles 1 mark Medium

In Fig. 1,

A O B

is a diameter of a circle with centre

O

and

A C

is a tangent to the circle at

A

. If

∠ B O C = 13 0^{\circ}

, then find

∠ A C O

Fig. 1 — diameter AOB, tangent AC at A, angle BOC = 130 degrees.

Answer

∠ A C O = 4 0^{\circ}

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