Question

iii) If the diameter of a circle is 9 cm, find the length of its radius.
(1+1+1=3)
20.
1) In a parallelogram, opposite sides are
and
ii) The quadrilateral whose all sides are equal are
ii) The quadrilateral having only one pair of parallel sides is
and
(1+1+1=3)
3
21. In an alloy, nickel is 35% and the rest is copper. Find the quantity of copper in 4kg of such an
alloy​

Answer 1

Answer:

iii) r=4.5cm

21))According to the question,

Let the alloy contains 45% nickel, 25% copper and

rest in zinc.

Zn=100−45−25

=30%

Since 1kg=1000gm

Therefore,

45×1000=450gofNi;

25×1000=250gofCu,

30×1000=300gofZn

Hence, 3kg

3000g×3=900gofZn present in 3 kg of alloy.

Answer 2

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An electrical network is an interconnection of electrical components or a model of such an interconnection, consisting of electrical elements. An electrical circuit is a network consisting of a closed loop, giving a return path for the current.