4. In an equilateral ∆ABC of side 10 cm, the side BC is trisected at D. Then, the length (in cm) of AD is
(a) 3√7
(b) 7√3
(c) (10√7)/3
(d) (7√10)/3
5. A point O in the interior of a rectangle ABCD is joined with each of the vertices A, B, C and D. Then,
(a) OB+OD = OC+OA
(b) OB^2+OA^2 = OC^2+OD^2
(c) OB.OD = OC.OA
(d) OB^2+OD^2 = OC^2+OA^2
10. From a point on a bridge across the river, the angles of depression of the bank on opposite side of the river are 30° and 45°, respectively. If the bridge is at a height of 2.5 m from the banks. Find the width of the river (Take √3=1.732)
(a) 5.78 m
(b) 6.83 m
(c) 7.24 m
(d) 6.7 m
Answers Key:
1. (c)
2. (d)
3. (c)
4. (c)
5. (d)
6. (d)
7. (d)
8. (b)
9. (c)
10. (b)
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