Just find the length of the bottom side.
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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To find the area of a triangle find the base and the height of the triangle. Then multiply the base by the height, then divide by 2. To find the perimiter of a triangle add together the outside edge of the triangle. To find the area of a triangle find the base and the height of the triangle. Then multiply the base by the height, then divide by 2. To find the perimiter of a triangle add together the outside edge of the triangle.
The answer depends on what information you do have about the triangle.
Find the area of the triangle 4inch tall 3.2 base
It is impossible to find the height of a triangle with just it's base.
Area of a triangle = 1/2*base*height