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Geometry help

Trapezoid $ABCD$ is inscribed in the semicircle with diameter $\overline{AB}$, as shown below. If $CD = 7$, $AD = 3$, and $BC = 3$, then find the radius of the semicircle.
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LaTeX Sep 7, 2021

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634

2

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More help this one is hard

Circles centered at $A$ and $B$ each have radius 2. Point $O$ is the midpoint of $\overline{AB}$, and $OA = 2\sqrt2$. Segments $OC$ and $OD$ are tangent to the circles centered at $A$ and $B$, respectively, and $\overline{EF}$ is a common tangent. What read more ..

LaTeX Aug 25, 2021

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377

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Help

Centers of adjacent faces of a unit cube are connected to form a regular octahedron. What is the volume of this octahedron?

LaTeX Aug 25, 2021

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453

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Sorry but I need a bit more help

What is the number of square centimeters in the area of the triangle shown? (See if you can solve the problem without Heron's Formula!)

LaTeX Aug 18, 2021