SOL Grades 6-8 Measurement and Geometry. Practice it free.

$V = \pi r^{2} h = 3 \times 9 \times 2 = 54$.

Each congruent angle is $\dfrac{180^{\circ} - 124.8^{\circ}}{2} = 27.6^{\circ}$.

A pentagon has $5$ sides: $(5-2) \times 180 = 540°$.

The right angle measures $90^{\circ}\textsf{,}$ and the sum of the interior angles of a triangle is $180^{\circ}\textsf{.}$ The other acute angle measures $180^{\circ} - 90^{\circ} - 22^{\circ} = 68^{\circ}\textsf{.}$

$90 - 10 = 80°$.

The circumference of a circle is $C = 2\pi r$. Substitute $r = 8$: $C = 2\pi(8) = 16\pi\textsf{.}$

Trapezoid area $= \dfrac{1}{2}(b_1 + b_2) \cdot h = \dfrac{1}{2}(6 + 10) \cdot 7 = \dfrac{1}{2}(16) \cdot 7 = 56$.

The area of a rhombus is half the product of the diagonals: $\dfrac{1}{2} \cdot 9 \cdot 12 = 54\text{ dm}^{2}\textsf{.}$