Hello can somedy help me please (all of them)

thank you in advance

area of the circle

=3.142×0.9²

=2.5450

=2.5cm²

circumference of the circle=2×3.142×4

=25.136cm

=25.1cm

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it