Q18 of 180 Page 4

Look at the

(i) 127.28 m2


(ii) πr2h


(iii) 90.5 m2


(iv) 32.73 m2


(v) 2/3 πr3


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16

17

Following f 19

To conduct 20

From a point P on the ground the angle of elevation of the top of a 10 m tall building is 30°. A flag is hoisted at the top of the building and angle of elevation of the top of the flagstaff from P is 45°.


(i) Find the length of flagstaff.


(a) 6.32 m


(b) 7.32 m


(c) 8.32 m


(d) 9.32 m


(ii) Find the distance of the building from the point P


(a) 17.32 m


(b) 18.32 m


(c) 19.32 m


(d) 20.32 m


(iii) What is the value of tan 30o?


(a) 1


(b) 3/2


(c) 3


(d) 1/3


(iv) What is the value of tan 45o?


(a) 2


(b) 0


(c) 1


(d) 3/2


(v) Write the Pythagoras theorem for ΔAPB.


(a) BP2 = AB2 + AP2


(b) AB2 = AP2 + BP2


(c) AP2 = AB2 + BP2


(d) None of these