Question
Find out the circumference of a sector whose radius is 7
cm and it makes the angle of 45° at the centre?Solution
Radius = AO = BO = 7 cm Length of arc AB = Circumference of circle × (angle of sector)/360 = 2πr × (45°)/(360°) = 2 × 22/7 × 7 × (45°)/(360°) = 5.5 cm Circumference of sector= arc AB + 2 × radius = 5.5 + 7 + 7 = 19.5cm.
The loudness of the sound depends uponÂ
‘Therm' is the unit of –
Electrical fuse is used to interrupt excess of _________.
Temperature of the Sun is measured by
Which atmospheric layer contains ozone layer?
Which pioneer of the late 19th century is credited with using radio waves for signal transmission over several kilometers?
For which type of motion, the distance time graph is not a straight line and can be any kind of curve?
What is the device used to amplify and modulate microwave frequency signals called?
How much calorie of energy is released by a boiled egg?
What is the SI unit of G — the universal gravitation constant?
Relevant for Exams:
