Understanding Parallelograms: Key Properties You Should Know

When it comes to geometry, understanding shapes like parallelograms is crucial. You might find yourself staring at a question on the FTCE that reads something like, "Which of the following statements is true about parallelograms?" and feel a little lost. Don't sweat it; we've got your back!

So, let's break it down. The options usually include:

A. Diagonals are equal
B. Opposite angles are always 90 degrees
C. Opposite sides are congruent
D. All angles are acute

Now here’s the thing—what’s the correct answer? It’s C. Opposite sides are congruent. That’s right! No matter what type of parallelogram you’re working with, you can always count on opposite sides being of equal length. This property isn't just a random fact; it’s foundational. It shapes the very identity of a parallelogram.

But what about the other statements? Let's clarify them, shall we?

Diagonals in Parallelograms
It’s true that the diagonals of a parallelogram bisect each other, but don’t get too comfortable—their lengths aren’t equal unless you're dealing with a rectangle or a rhombus. Think of it this way: in the case of regular shapes, you often find symmetry, but parallelograms don’t always play by the same rules.

Opposite Angles
Next up, let’s chat about angles. The statement that opposite angles are always 90 degrees? Nah, that’s not true for all parallelograms. Sure, in rectangles, you can expect that perfect right angle at every corner. But a typical parallelogram? It can have angles of varying measures. They’re equal, but they’re not always 90 degrees. And that’s a big distinction!

Acute Angles
Finally, we can't forget about angle types. Yes, it’s possible for a parallelogram to have all acute angles, but that’s not a given. Parallelograms can also have obtuse angles. So, don’t fall into the trap of thinking every angle must be less than 90 degrees. Geometry likes to keep us on our toes!

So what does all of this mean for your studies as you prepare for the FTCE? Understanding these properties is more than just memorizing a list; it’s about learning to see how these concepts connect to the larger framework of geometry. Each property builds on the last, helping you to think critically and solve problems that might initially seem daunting.

In conclusion, when you're facing questions about parallelograms on your exam, keep in mind that opposite sides are what truly define these shapes. You’ve got this—armed with this knowledge, you’re better prepared to tackle any geometry question that comes your way. Keep on learning, and good luck with your studies!