Question

(ii) one please help​

Answer 1

Answer:

Step-by-step explanation:

For the small semicircular part, r=1cm

So area =1/2πr²

Area(A1)=11/7cm²

For the rectangular part,

Area(A2)=4×3=12cm²

For the big semicircular part,

r=2cm

Area(A3)=1/2πr²=44/7cm²

Total area (A)=44/7+11/7+12

=139/7 cm²

Answer 2

Answer:

Area of bigger semi circle = 1/2πr2

=1/2 x 3.14 x 2x2

=6.28cm sq.

Area of Rec. = LxB

=4x3

=12cm sq.

Area of small semi circle = 1/2πr2

=1/2 x 3.14 x (1)sq.

=3.14/2= 1.57cm sq.

Step-by-step explanation:

*radius of bigger semi circle will be half of its diameter 4 so, radius will be 2cm.

*length of rec. will be 4 becoz it is same as the diameter of bigger semi circle

*and finally the diameter of small circle will be 2cm and its radius will be 1cm