Question

I want 19,20,21,22,23 questions I want to prepare for my exam please help for me​

Answer 1

Answer:

Step-by-step explanation:

19. area of trapezium=1/2*(sum of parallel sides)*h

                                  =1/2*(6.6+8.4)*6

                                  =1/2*15*6

                                  =45

20.here AC is the diagonal of parallelogram ABCD

    so, it bisects the parallelogram ABCD into two equal parts

    ar(ABC)=ar(ACD)=30

    ar(ABC)+ar(ACD)=ar(ABCD)

    30+30=60

21.diameter=r

    radius=1/2d

    area=πr²

           =π(1/2d)²

           =πd²/4

22. let the areas of the circle be 4x and 9x

     area=πr²

     area of both circles =π(r₁)²=4x and π(r₂)₂=9x

      ATQ

     4x/9x=π(r₁)²/=π(r₂)²

     4/9=(r₁)²/(r₂)²

     so, r₁=2 and r₂=3

    now d₁=4 and d₂=6

    their ratio is 4/6=2/3=2:3

23. it is given that

     the side of a square = the radius of a circle=r

     ATQ

    r₂/πr²

   =1/π

   =1:π