Question

1. Choose the correct option and write :
1 x 5= 5
(1) If the shadow of a person standing in sun is
$\sqrt{3}$
times its height, then the
angle of elevation of sun is :
(a) 30°
(b) 45°
(c) 60°
(d) 75°.
(ii) If radius of two concentric circles are 4 cm and 5 cm, then the length of each
chord of one circle which is tangent to the other circle is:
(a) 3 cm
(b)6 cm
(c) 9 cm
(d) 1 cm.
(iii) The relation between an arc of a circle, radius of the circle and the angle
subtended by the arc at the centre of the circle is:
(a) Angle = arc x radius
(b) Arc = angle * radius
(c) Radius = arc x angle
(d) None of the above.
(iv) If two solid hemisphere of same base radius r are joined together along
their bases, then the curved surface area of this new solid is :
(a) 4πr2
(b)6πr2
(c) 3πr2
(d) 8πr2
(v) If an event cannot occur, then its probability is :
(a) 1
(6) 3/4
(c) 1/2
(d) 0.
​

Answer 1

Answer:

45°

9cm

radius = arc x angle

4πr2

0

Step-by-step explanation:

hope the answer help you