Depends on what formula.
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Turn the triangle into a square work out the area for that then half your answer ---- For an equilateral triangle, use the formula 1/2 x base x perpendicular height to work out the area.
The formula for finding the area of a triangle is base multiplied by height divided by two(B*H/2)Made by: Christine Ayoh
The area of any triangle has the same formula, which is base times height, divided by 2. A scalene triangle is a triangle with three sides of unequal length, which is not important when calculating the area.
there is no specific formula for isos triangle..... 1/2bh..which means 1/2xbasexheight is the formula for all types of triangles.....so if we take isos as a triangle we can use this formula to calculate the area of the figure!
Using the formula 1/2 ab sin C