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The perimeter of the shaded region in the given figure is :
OAB is sector of a circle with centre O and radius 7 cm. If length of arc AB = 22/3 cm, then ∠AOB is equal to
AB and CD are diameters of a circle with centre O and radius 7 cm. If ∠BOD = 30°, then find the area and perimeter of the shaded region.
From a point on the ground, the angle of elevation of the bottom and the top of a transmission tower fixed at the top of a 20 m high building are 45° and 60° respectively. Find the height of the tower.
In the given figure, two concentric circles are shown, centred at O. The radii of the circles are OA = 3 cm and OB = 6 cm. Find perimeter of the shaded region. (Use π = 3·14)
Age of a tree : The most accurate way to determine the age of a tree is to count the annual rings of wood growth. One such trunk has been shown here. To make an identification mark, the forest department has painted segment ACBA. (See diagram) If chord AB makes an angle 90° at the centre and radius of the trunk is 21 cm, then find the :
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