Is a triangle with sides 3, 4, 5 a right triangle? Let’s find out…

How to determine if a triangle is a right triangle by using the Pythagorean Theorem.

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TC Math Notes

[arubaguy]

I've used the 3-4-5 method for laying out accurate square corners on garden plots and concrete slab pours for many decades. It can be applied to any size area simply by using multiples of 3, 4, and 5. For example, establish a line 15 feet in length, connect a line 20 feet long to the first, start point to start point. Then, leaving their start points connected, adjust the first two lines until their endpoints are 25 feet apart, and you have your 90 degree angle. I use stakes and string to do it. The resulting triangle's corners are 30, 60, and 90 degrees EXACTLY.

[loneranger]

Yes. If A squared = B squared + C squared. Pythagoras theorem

[TamiHoshiyama]

Yes, according to the Pythagorean Theorem

[pgjbsn]

A squared plus B squared = C squared. 4 squared + 3 squared = 5 squared

[invertedrd]

It’s a right triangle if one of the angles is 90 degrees.

[ceasarasmith]

Why is math taught this way. I've found out that this is Greek and Romans math and is the hardest math to learn. Why teach what so many people say is the hardest for them to learn. Math I was told can be taught other ways for people to learn . Not being mean, just wished I asked for help in math years ago.