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Find the circumference of a circle whose area is 16 times the area of the circle with diameter 7cm (Ans: 88cm)
Ans: Π R2 = 16 Π r2
R2 = 16 r 2
R2 = 16 x 7/2 x 7/2
= 49 x 4 ⇒ R = 7 x 2 = 14cm
Circumference = 2 x 22/7 x 14 = 2 x 22 x 2 = 88 cm
In the adjoining figure, ABCD is a square of side 6cm. Find the area of the shaded region. Ans: From P draw PQ ⊥ AB AQ = QB = 3cm (Ans: 34.428 sq cm) Join PB
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Now we need to move onto something called function notation. Function notation will be utilized heavily throughout most of remaining section and so it is important to understand i
R={(r, ?):1=r= 2cos? ,-p/3= ? =p/3
HISTORY OF UNITARY METHOD
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