Question

Fig. (li)
6. Find the area of the circle whose diameter is 42 cm.
7. The width of a cloth is 20 m. Calculate the length of the cloth required to
make 2000 handkerchiefs if each hanky is of size 40 cm by 15 cm.
8. Find the area of a triangle whose base is 24 cm and height is 12 cm.
9. One side of a right angled triangle is twice the other and the hypotenuse is 10
cm. Find the area of the triangle.
10. If the diagonal of a square is made 1.5 times the other square, then find the
ratio of the area of bigger square to the smaller squares.
11. The area of a square field is 69696 cm2. Find the length of its diagonal.​

Answer 1

Answer:

22/7×21×21=1386

Step-by-step explanation:

area of circle is pii r2.

8. 1/2×b×h

1/2×24×12= 12×12=144

Answer 2

Answer:

ans 6 - we know that area of circle is π r^2

diameter = 42 cm

radius = diameter/2

radius= 42 /2

radius= 21

area of circle is π r^2

= 22/7 × 21^2

=22/7 × 441

=22× 63

=1386 cm^2