Class 10 Exam > Class 10 Notes > Lab Manuals for Class 10 > Viva Voce: Areas of Sectors formed at the Vertices of a Triangle
Viva Voce: Areas of Sectors formed at the Vertices of a Triangle | Lab Manuals for Class 10 PDF Download
Q.1. What is the sum of angles of four sectors of same radii ‘r’ formed at the vertices (as centre) at any quadrilateral?
360°
Q.2. What is the area of a semicircle of radius 2 cm?
2π
Q.3. What is the difference between a sector and a segment of a circle?
A sector of a circle is formed by an arc and two radii of the circle, while a segment is one of its part in which a chord divides a circle.
Q.4. “A tangent intersects the circle in more than one point”. Is the statement true or false?
False
Q.5. What is the angle subtended by a circle at centre?
360°
Q.6. If the perimeter of semicircle is 12 cm, find its radius.
7/3 cm
Q.7. Define a segment of a circle.
A chord divides a circle in two parts each of which is called a segment of a circle.
Q.8. Define chords.
A line segment joining two points on the circumference of a circle is known as a chord.
Q.9. Area of the sector of a circle with radius 4 cm and angle 30° is
4.19 cm
Q.10. △ABC is an equilateral triangle. If each sector at the three vertices is of radius r cm, calculate the total area of the sectors.
3 x θ/360° x πr2
= 3 x 60°/360° x πr2
= 1/2πr2
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