22
AB and CD are respectively arcs of two concentric circles of radi
21 cm. and 7 cm. with centre O (See figure). If ZAOB = 30° , find
the area of the shaded region. (use ti ==
Answers
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2
Answer:
Shaded area = Area of sector OAB - Area of sector OCD
Shaded region = (
360
30
×
7
22
×21×21−
360
30
×
7
22
×7×7)cm
2
Shaded region =
360
30
×
7
22
×(21×21−7×7)cm
2
Shaded area =
42
11
×(21+7)×(21−7)cm
2
Shaded region =
42
11
×28×14 cm
2
= 102.67 cm
2
Step-by-step explanation:
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