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The base of a triangle is almost always the side it lays on.

Just find the length.

If you're looking for how to solve it with algebra, given: Area=30 and Height=4

Remember: Area of a triangle = 1/2 (base ) x (height)

Then write the equation: 30 = 1/2 (base) x (4)

To solve it, divide each side by 2 :

15 = (base)

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Q: How do you find the base in triangles?

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Base times height divided by 2 :)

you use base times height divided by 2

area = 1/2 base x height

Triangles you use : (base x perpendicular height) divided by 2. Parallelogram: you need to find the area of one of the side triangles, then double it (because there's two of them). Then find the area of the square in the middle, and add this to the area of the two triangles.

area =1/2 base length x height

If you know the hypotenuse and the base then use Pythagoras' theorem to find the altitude

Area = 0.5*base*perpendicular height

In a pyramid, all the faces that go from the base to meet at the apex are triangles, one on each side of the base. For a square base pyramid, there are 4 sides to the base, so there are 4 triangles Be careful with a triangular based pyramid, there are 3 triangles from the base to the apex, but there is also the triangle of the base itself, so there are 4 triangles in a triangular based pyramid.

For all triangles: area = 1/2 * base * height

you cant you have to download it.

A=1/2bh The area of a triangle is 1/2bh. If the base of it is a triangle and all 4 of the triangles aren't the same, then you have to find the area of the base triangle and then the three other triangles (which should all have the same area). If all four of the triangles have the same area, then just find the area of one of the triangles and multiply that by four. A triangular pyramid that has four equal triangles is also called a tetrahedron.

For all triangles: area = 1/2 * base * height

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