draw in the height, and you will have a 30-60-90 right-angled triangle
height^2 + 3^2 = 6^2
height^2= 36-9 = 27
height = √27
area = (1/2)base x height = (1/2)(6)√27 = 9√3
= 15.6
If a=6cm, find the area of the equilateral triangle. Round the answer to one decimal place.
1 answer