If you are trying to find the area of the triangle you could use trig to find the height of the triangle and then use the formula 1/2 base x height.
So draw the Isoceles triangle with each leg 3cm and the base 4cm
Draw a centre line forming two right angled triangles
find the angle of the lower corner of the triangle(it doesnt matter which one)
Using cos = adj/hyp
therefore cos = 2/3
then say sin(48.1896...)= h/3 to find the height
h= 2.236...
once the height is found multiply half base by height.
2x2.236...= 4.4721...
an isoceles triangle given the base and a leg whose measure are 4cm and 3cm respectively?
1 answer