3^2 = 9
21^2 = 441
9 x 441 =
3969
A= 2pi(radius)(height)+2pi(radius)^2
Mark me as brainiest! <3
We can also classify triangles by their sides.<span>scalene triangle-a triangle with no congruent sides.isosceles triangle-a triangle with at least 2 congruent sides (i.e. 2 or 3 congruent sides)equilateral triangle-a triangle with exactly 3 congruent sides.<span>NOTE:</span></span>
Area: 20 x 30 so 600
perimeter: 20 + 20 + 30 + 30 = 100
The difference of two squares. The number which, when multiplied together three times yields the original number.
