21,211.
A.
391km
B.
503km
C.
782km
D.
1006km
E.
2012km
Correct answer is C
θ360
* 2πR=
7360
* 2 * 227
* 6400 = 782km 21,212.
A.
135o
B.
105o
C.
90o
D.
75o
E.
60o
Correct answer is D
\(\Delta RPS\) = Isosceles triangle
\(\therefore < RPS = \frac{180° - 90°}{2}\)
= 45°
In \(\Delta QPR\),\(\sin < QPR = \frac{1}{2}\)
= 30°
\(\therefore < QPS = 30° + 45° = 75°\)
21,213.
A.
33o
B.
40o
C.
90o
D.
180o
E.
270o
Correct answer is D
Circumference = 2πr
2 x 22/7 x 3.5 ≅ 22m
22m = 360o
11m = 360/22 x 11 = 180o
21,214.
A.
67o
B.
100o
C.
113o
D.
126o
E.
134o
Correct answer is E
From the diagram, < LMN = 180° - (74° + 39°) (sum of angle in a triangle)
= 67°
< LON = 2 x 67° (angle subtended at the centre is twice the angle at the circumference)
= 134°
21,215.
slant height t = 14cm
curved surface area of cone = πrl
=> 3.142 x 3.5 x 14 = 153.95
A.
22cm2
B.
38.5cm2
C.
77cm2
D.
154cm2
E.
308cm2
Correct answer is D
Length of arc =
θ360
* 2πr=> r =
90360
* 144
= 3.5 slant height t = 14cm
curved surface area of cone = πrl
=> 3.142 x 3.5 x 14 = 153.95
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