Question 35 (OR 2nd question) - CONCEPT Construct a pair of tangents to a circle of radius 3 cm which are inclined to each other at an angle of 60°
Given angle between tangents is 60°
i.e. ∠ QPR = 60°
Since Angle at center is double the angle between tangents
∴ ∠ OQR = 2 × 60° = 120°
So, we need to draw ∠ QOR = 120°
∴ We draw a radius, then second radius at 120° from first.
Also,
Tangent is perpendicular to radius
So, OQ ⊥ QP & OR ⊥ PR
Thus, to make tangents,
we draw perpendicular from point Q and R
So, we draw 90° from point Q and point R
Thus, our figure will look like
Question 35 (OR 2nd question) Construct a pair of tangents to a circle of radius 3 cm which are inclined to each other at an angle of 60°
Steps of construction
Draw a circle of radius 3 cm
Draw horizontal radius OQ
3. Draw angle 120° from point O
Let the ray of angle intersect the circle at point R
Now, draw 90° from point Q
5. Draw 90° from point R
6. Where the two arcs intersect, mark it as point P
∴ PQ and PR are the tangents at an angle of 60°

CBSE Class 10 Sample Paper for 2020 Boards - Maths Standard

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.