# Masum has drawn a

Theory.

Exterior angle is sum of opposite interior angles

if 2 sides of triangle are equal then their corresponding angles will also be equal

Solution.

In Δ AOB

AO = OB (radius of same circle )

OAB = OBA = 21°

In Δ BOT

BOT = OAB + OBA (Exterior angle property)

= 21° + 21° = 42°

OBT = 90° (Radius of circle from point of contact of tangent is 90° )

OBT + BOT + BTO = 180° (Angle sum property)

90° + 42° + BTO = 180°

BTO = 180° - 132° = 48°

BTO = BTA = 48°

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Area Related to Circles- Important Formula and Concepts59 mins
Introduction to Linear Equations in Two Variables62 mins
A Sweet Tooth for Modals41 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses
RELATED QUESTIONS :

<span lang="EN-USWest Bengal Board - Mathematics

<span lang="EN-USWest Bengal Board - Mathematics

Masum has drawn aWest Bengal Board - Mathematics

Two chords AB andWest Bengal Board - Mathematics

<span lang="EN-USWest Bengal Board - Mathematics

<span lang="EN-USWest Bengal Board - Mathematics

Two radii OA and West Bengal Board - Mathematics

I drew a circle hWest Bengal Board - Mathematics

XY is a diameter West Bengal Board - Mathematics