Teaching triangles in the fourth grade is something that you can do by first classifying those triangles in very specific ways. Teach triangles in the fourth grade with help from a professional private tutor in this free video clip.

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Teaching triangles in the fourth grade is something that you can do by first classifying those triangles in very specific ways. Teach triangles in the fourth grade with help from a professional private tutor in this free video clip.

Part of the Video Series: Math Made Easy

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Hi, I'm Rachel, and today we're going to be going over teaching triangles to fourth graders. So it's good for them to learn the few different types of triangles. There's different ways we can classify triangles. One is we can call a triangle equilateral, right, if it has all equal sides. There's also an Isosceles Triangle which has two equal sides and a third side that's not equal and then there's a scalene triangle which I mean it sounds like a weird word right, so have them familiarize themself with like a weird word scalene where all three sides are different. It's also important to teach them area and perimeter of a triangle. The perimeter of a triangle is just adding up the sides, right, have them think of a fence. If they were to put fencing on a triangle, you know, shape of a lawn or something, it's just going to be the side, side 1 plus side 2, plus side 3 and that's it. The area is going to be one half the base of the triangle times the height of the triangle. This is a little bit more tricky sometimes for them to remember but in a, you know, in something like this, a nice equilateral triangle, we have the base and then we have the height which we just draw with a dotted line and we show that it's perpendicular to the base, right. The height is always perpendicular to the base and then they will just have to find one half the base times the height and make sure they write those units squared because it's area. Perimeter they just write the units not squared. Also it's good for them to know the different types of angles. You can have acute triangles where all the triangles are less than you know, 90 degrees. You can have right triangles where there's actually a right angle in the triangle and then you can have an obtuse triangle where it has an obtuse angle that's over 90 degrees. It's also one more last thing, important for them to know that a triangle has 180 degrees total. So they can add up the different angles and find you know, what the missing angle would be knowing that there's 180 degrees total. I'm Rachel and thanks for learning with us today.