Question

calculate the following.
please give me answer of this.​

Answer 1

1. radius =7 cm

circumference = 2πr

$2 \times \frac{22}{7} \times 7 = 44cm$

2.

$area \: of \: rectangle \: = (l \times b) \\ 440m ^{2} \: \: \: \: \: \: \: \: \: \: = (22 \times b) \\ \frac{440}{22 } = b \\ 20m = b$

Hence breadth is 20 m.

Now,

perimeter =2×(l + b)

=2×(22+20)

=2×(42)

=84m

3.

$3(x + 2) + 5x + 7 \\ 3(2 + 2) + (5 \times 2) + 7 \\( 3 \times 4) + 10 + 7 \\ 12 + 10 + 7 \\ 29$