To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.

(7a)(9ab) + (8a²)(6b)
(7 x 9)(a x a x b) + (8 x 6)(a² x b)
(63)(a¹⁺¹ x b) + (48)(a²b)
63a²b + 48a²b
111a²b

A trapezoid is a quadrilateral with one set of parallel sides.

A rhombus is a parallelogram with four equal-length sides. A square is a rectangle with four equal-length sides.

A circle is a figure in which each point around its perimeter is an equal distance from the center. The radius of a circle is the distance between the center and any point along its perimeter. A chord is a line segment that connects any two points along its perimeter. The diameter of a circle is the length of a chord that passes through the center of the circle and equals twice the circle's radius (2r).

A monomial contains one term, a binomial contains two terms, and a polynomial contains more than two terms.