Mira has a circular cardboard with centre 0. The cardboard has been divided into three regions labelled X, Y and Z by diameter AB and radius OC as shown in the following figure. She places a fair spinner at the centre of the cardboard. If ∆BOC = 45° answer each of the following questions:
1. the probability that the spinner will land in the region x, is
a. 1/4 b) 1/2 c) 1/8 d) 3/8
2. the probablity that the spinner will land in the region y, is
a) 1/4 b) 1/2 c) 1/8 d) 3/8
3. the probability that the spinner will land land in the region z is
a) 1/4 b) 1/2 c) 1/8 d) 3/8
4. the probability that the spinner will land in the region x Or z is
a) 1/4 b) 1/2 c) 1/8 d) 3/8
5. the probabilty that the spinner will land in the region y Or z is
a) 3/8 b) 1/2 c) 5/8 d) 1/8
Answers
Answered by
1
Step-by-step explanation:
R=3cm, H=10.5cm
⇒Surface area = Curved Surface Area + Base Area
=2πrh+πr
2
=2×
7
22
×3×
10
10.5
+
7
22
×3×3cm
2
=198+
7
198
cm
2
=
7
1584
cm
2
⇒Area of cardboard sheet used by competitor =
7
1584
cm
2
⇒Area of cardboard sheet used by 35 competitors =
7
1584
×35
=7920cm
2
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